Theta Smart Contracts | ThetaScan.io

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Published Contract:

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts@4.5.0/interfaces/IERC3156FlashBorrower.sol


// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156FlashBorrower.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC3156 FlashBorrower, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashBorrower {
 /**
 * @dev Receive a flash loan.
 * @param initiator The initiator of the loan.
 * @param token The loan currency.
 * @param amount The amount of tokens lent.
 * @param fee The additional amount of tokens to repay.
 * @param data Arbitrary data structure, intended to contain user-defined parameters.
 * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
 */
 function onFlashLoan(
 address initiator,
 address token,
 uint256 amount,
 uint256 fee,
 bytes calldata data
 ) external returns (bytes32);
}

// File: @openzeppelin/contracts@4.5.0/interfaces/IERC3156FlashLender.sol


// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156FlashLender.sol)

pragma solidity ^0.8.0;


/**
 * @dev Interface of the ERC3156 FlashLender, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashLender {
 /**
 * @dev The amount of currency available to be lended.
 * @param token The loan currency.
 * @return The amount of `token` that can be borrowed.
 */
 function maxFlashLoan(address token) external view returns (uint256);

 /**
 * @dev The fee to be charged for a given loan.
 * @param token The loan currency.
 * @param amount The amount of tokens lent.
 * @return The amount of `token` to be charged for the loan, on top of the returned principal.
 */
 function flashFee(address token, uint256 amount) external view returns (uint256);

 /**
 * @dev Initiate a flash loan.
 * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
 * @param token The loan currency.
 * @param amount The amount of tokens lent.
 * @param data Arbitrary data structure, intended to contain user-defined parameters.
 */
 function flashLoan(
 IERC3156FlashBorrower receiver,
 address token,
 uint256 amount,
 bytes calldata data
 ) external returns (bool);
}

// File: @openzeppelin/contracts@4.5.0/interfaces/IERC3156.sol


// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156.sol)

pragma solidity ^0.8.0;



// File: @openzeppelin/contracts@4.5.0/utils/math/SafeCast.sol


// OpenZeppelin Contracts v4.4.1 (utils/math/SafeCast.sol)

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
 /**
 * @dev Returns the downcasted uint224 from uint256, reverting on
 * overflow (when the input is greater than largest uint224).
 *
 * Counterpart to Solidity's `uint224` operator.
 *
 * Requirements:
 *
 * - input must fit into 224 bits
 */
 function toUint224(uint256 value) internal pure returns (uint224) {
 require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
 return uint224(value);
 }

 /**
 * @dev Returns the downcasted uint128 from uint256, reverting on
 * overflow (when the input is greater than largest uint128).
 *
 * Counterpart to Solidity's `uint128` operator.
 *
 * Requirements:
 *
 * - input must fit into 128 bits
 */
 function toUint128(uint256 value) internal pure returns (uint128) {
 require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
 return uint128(value);
 }

 /**
 * @dev Returns the downcasted uint96 from uint256, reverting on
 * overflow (when the input is greater than largest uint96).
 *
 * Counterpart to Solidity's `uint96` operator.
 *
 * Requirements:
 *
 * - input must fit into 96 bits
 */
 function toUint96(uint256 value) internal pure returns (uint96) {
 require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
 return uint96(value);
 }

 /**
 * @dev Returns the downcasted uint64 from uint256, reverting on
 * overflow (when the input is greater than largest uint64).
 *
 * Counterpart to Solidity's `uint64` operator.
 *
 * Requirements:
 *
 * - input must fit into 64 bits
 */
 function toUint64(uint256 value) internal pure returns (uint64) {
 require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
 return uint64(value);
 }

 /**
 * @dev Returns the downcasted uint32 from uint256, reverting on
 * overflow (when the input is greater than largest uint32).
 *
 * Counterpart to Solidity's `uint32` operator.
 *
 * Requirements:
 *
 * - input must fit into 32 bits
 */
 function toUint32(uint256 value) internal pure returns (uint32) {
 require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
 return uint32(value);
 }

 /**
 * @dev Returns the downcasted uint16 from uint256, reverting on
 * overflow (when the input is greater than largest uint16).
 *
 * Counterpart to Solidity's `uint16` operator.
 *
 * Requirements:
 *
 * - input must fit into 16 bits
 */
 function toUint16(uint256 value) internal pure returns (uint16) {
 require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
 return uint16(value);
 }

 /**
 * @dev Returns the downcasted uint8 from uint256, reverting on
 * overflow (when the input is greater than largest uint8).
 *
 * Counterpart to Solidity's `uint8` operator.
 *
 * Requirements:
 *
 * - input must fit into 8 bits.
 */
 function toUint8(uint256 value) internal pure returns (uint8) {
 require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
 return uint8(value);
 }

 /**
 * @dev Converts a signed int256 into an unsigned uint256.
 *
 * Requirements:
 *
 * - input must be greater than or equal to 0.
 */
 function toUint256(int256 value) internal pure returns (uint256) {
 require(value >= 0, "SafeCast: value must be positive");
 return uint256(value);
 }

 /**
 * @dev Returns the downcasted int128 from int256, reverting on
 * overflow (when the input is less than smallest int128 or
 * greater than largest int128).
 *
 * Counterpart to Solidity's `int128` operator.
 *
 * Requirements:
 *
 * - input must fit into 128 bits
 *
 * _Available since v3.1._
 */
 function toInt128(int256 value) internal pure returns (int128) {
 require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits");
 return int128(value);
 }

 /**
 * @dev Returns the downcasted int64 from int256, reverting on
 * overflow (when the input is less than smallest int64 or
 * greater than largest int64).
 *
 * Counterpart to Solidity's `int64` operator.
 *
 * Requirements:
 *
 * - input must fit into 64 bits
 *
 * _Available since v3.1._
 */
 function toInt64(int256 value) internal pure returns (int64) {
 require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits");
 return int64(value);
 }

 /**
 * @dev Returns the downcasted int32 from int256, reverting on
 * overflow (when the input is less than smallest int32 or
 * greater than largest int32).
 *
 * Counterpart to Solidity's `int32` operator.
 *
 * Requirements:
 *
 * - input must fit into 32 bits
 *
 * _Available since v3.1._
 */
 function toInt32(int256 value) internal pure returns (int32) {
 require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits");
 return int32(value);
 }

 /**
 * @dev Returns the downcasted int16 from int256, reverting on
 * overflow (when the input is less than smallest int16 or
 * greater than largest int16).
 *
 * Counterpart to Solidity's `int16` operator.
 *
 * Requirements:
 *
 * - input must fit into 16 bits
 *
 * _Available since v3.1._
 */
 function toInt16(int256 value) internal pure returns (int16) {
 require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits");
 return int16(value);
 }

 /**
 * @dev Returns the downcasted int8 from int256, reverting on
 * overflow (when the input is less than smallest int8 or
 * greater than largest int8).
 *
 * Counterpart to Solidity's `int8` operator.
 *
 * Requirements:
 *
 * - input must fit into 8 bits.
 *
 * _Available since v3.1._
 */
 function toInt8(int256 value) internal pure returns (int8) {
 require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits");
 return int8(value);
 }

 /**
 * @dev Converts an unsigned uint256 into a signed int256.
 *
 * Requirements:
 *
 * - input must be less than or equal to maxInt256.
 */
 function toInt256(uint256 value) internal pure returns (int256) {
 // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
 require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
 return int256(value);
 }
}

// File: @openzeppelin/contracts@4.5.0/governance/utils/IVotes.sol


// OpenZeppelin Contracts (last updated v4.5.0) (governance/utils/IVotes.sol)
pragma solidity ^0.8.0;

/**
 * @dev Common interface for {ERC20Votes}, {ERC721Votes}, and other {Votes}-enabled contracts.
 *
 * _Available since v4.5._
 */
interface IVotes {
 /**
 * @dev Emitted when an account changes their delegate.
 */
 event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

 /**
 * @dev Emitted when a token transfer or delegate change results in changes to a delegate's number of votes.
 */
 event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);

 /**
 * @dev Returns the current amount of votes that `account` has.
 */
 function getVotes(address account) external view returns (uint256);

 /**
 * @dev Returns the amount of votes that `account` had at the end of a past block (`blockNumber`).
 */
 function getPastVotes(address account, uint256 blockNumber) external view returns (uint256);

 /**
 * @dev Returns the total supply of votes available at the end of a past block (`blockNumber`).
 *
 * NOTE: This value is the sum of all available votes, which is not necessarily the sum of all delegated votes.
 * Votes that have not been delegated are still part of total supply, even though they would not participate in a
 * vote.
 */
 function getPastTotalSupply(uint256 blockNumber) external view returns (uint256);

 /**
 * @dev Returns the delegate that `account` has chosen.
 */
 function delegates(address account) external view returns (address);

 /**
 * @dev Delegates votes from the sender to `delegatee`.
 */
 function delegate(address delegatee) external;

 /**
 * @dev Delegates votes from signer to `delegatee`.
 */
 function delegateBySig(
 address delegatee,
 uint256 nonce,
 uint256 expiry,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) external;
}

// File: @openzeppelin/contracts@4.5.0/utils/Strings.sol


// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
 bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

 /**
 * @dev Converts a `uint256` to its ASCII `string` decimal representation.
 */
 function toString(uint256 value) internal pure returns (string memory) {
 // Inspired by OraclizeAPI's implementation - MIT licence
 // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

 if (value == 0) {
 return "0";
 }
 uint256 temp = value;
 uint256 digits;
 while (temp != 0) {
 digits++;
 temp /= 10;
 }
 bytes memory buffer = new bytes(digits);
 while (value != 0) {
 digits -= 1;
 buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
 value /= 10;
 }
 return string(buffer);
 }

 /**
 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
 */
 function toHexString(uint256 value) internal pure returns (string memory) {
 if (value == 0) {
 return "0x00";
 }
 uint256 temp = value;
 uint256 length = 0;
 while (temp != 0) {
 length++;
 temp >>= 8;
 }
 return toHexString(value, length);
 }

 /**
 * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
 */
 function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
 bytes memory buffer = new bytes(2 * length + 2);
 buffer[0] = "0";
 buffer[1] = "x";
 for (uint256 i = 2 * length + 1; i > 1; --i) {
 buffer[i] = _HEX_SYMBOLS[value & 0xf];
 value >>= 4;
 }
 require(value == 0, "Strings: hex length insufficient");
 return string(buffer);
 }
}

// File: @openzeppelin/contracts@4.5.0/utils/cryptography/ECDSA.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;


/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
 enum RecoverError {
 NoError,
 InvalidSignature,
 InvalidSignatureLength,
 InvalidSignatureS,
 InvalidSignatureV
 }

 function _throwError(RecoverError error) private pure {
 if (error == RecoverError.NoError) {
 return; // no error: do nothing
 } else if (error == RecoverError.InvalidSignature) {
 revert("ECDSA: invalid signature");
 } else if (error == RecoverError.InvalidSignatureLength) {
 revert("ECDSA: invalid signature length");
 } else if (error == RecoverError.InvalidSignatureS) {
 revert("ECDSA: invalid signature 's' value");
 } else if (error == RecoverError.InvalidSignatureV) {
 revert("ECDSA: invalid signature 'v' value");
 }
 }

 /**
 * @dev Returns the address that signed a hashed message (`hash`) with
 * `signature` or error string. This address can then be used for verification purposes.
 *
 * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
 * this function rejects them by requiring the `s` value to be in the lower
 * half order, and the `v` value to be either 27 or 28.
 *
 * IMPORTANT: `hash` _must_ be the result of a hash operation for the
 * verification to be secure: it is possible to craft signatures that
 * recover to arbitrary addresses for non-hashed data. A safe way to ensure
 * this is by receiving a hash of the original message (which may otherwise
 * be too long), and then calling {toEthSignedMessageHash} on it.
 *
 * Documentation for signature generation:
 * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
 * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
 *
 * _Available since v4.3._
 */
 function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
 // Check the signature length
 // - case 65: r,s,v signature (standard)
 // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
 if (signature.length == 65) {
 bytes32 r;
 bytes32 s;
 uint8 v;
 // ecrecover takes the signature parameters, and the only way to get them
 // currently is to use assembly.
 assembly {
 r := mload(add(signature, 0x20))
 s := mload(add(signature, 0x40))
 v := byte(0, mload(add(signature, 0x60)))
 }
 return tryRecover(hash, v, r, s);
 } else if (signature.length == 64) {
 bytes32 r;
 bytes32 vs;
 // ecrecover takes the signature parameters, and the only way to get them
 // currently is to use assembly.
 assembly {
 r := mload(add(signature, 0x20))
 vs := mload(add(signature, 0x40))
 }
 return tryRecover(hash, r, vs);
 } else {
 return (address(0), RecoverError.InvalidSignatureLength);
 }
 }

 /**
 * @dev Returns the address that signed a hashed message (`hash`) with
 * `signature`. This address can then be used for verification purposes.
 *
 * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
 * this function rejects them by requiring the `s` value to be in the lower
 * half order, and the `v` value to be either 27 or 28.
 *
 * IMPORTANT: `hash` _must_ be the result of a hash operation for the
 * verification to be secure: it is possible to craft signatures that
 * recover to arbitrary addresses for non-hashed data. A safe way to ensure
 * this is by receiving a hash of the original message (which may otherwise
 * be too long), and then calling {toEthSignedMessageHash} on it.
 */
 function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
 (address recovered, RecoverError error) = tryRecover(hash, signature);
 _throwError(error);
 return recovered;
 }

 /**
 * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
 *
 * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
 *
 * _Available since v4.3._
 */
 function tryRecover(
 bytes32 hash,
 bytes32 r,
 bytes32 vs
 ) internal pure returns (address, RecoverError) {
 bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
 uint8 v = uint8((uint256(vs) >> 255) + 27);
 return tryRecover(hash, v, r, s);
 }

 /**
 * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
 *
 * _Available since v4.2._
 */
 function recover(
 bytes32 hash,
 bytes32 r,
 bytes32 vs
 ) internal pure returns (address) {
 (address recovered, RecoverError error) = tryRecover(hash, r, vs);
 _throwError(error);
 return recovered;
 }

 /**
 * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
 * `r` and `s` signature fields separately.
 *
 * _Available since v4.3._
 */
 function tryRecover(
 bytes32 hash,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) internal pure returns (address, RecoverError) {
 // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
 // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
 // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
 // signatures from current libraries generate a unique signature with an s-value in the lower half order.
 //
 // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
 // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
 // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
 // these malleable signatures as well.
 if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
 return (address(0), RecoverError.InvalidSignatureS);
 }
 if (v != 27 && v != 28) {
 return (address(0), RecoverError.InvalidSignatureV);
 }

 // If the signature is valid (and not malleable), return the signer address
 address signer = ecrecover(hash, v, r, s);
 if (signer == address(0)) {
 return (address(0), RecoverError.InvalidSignature);
 }

 return (signer, RecoverError.NoError);
 }

 /**
 * @dev Overload of {ECDSA-recover} that receives the `v`,
 * `r` and `s` signature fields separately.
 */
 function recover(
 bytes32 hash,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) internal pure returns (address) {
 (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
 _throwError(error);
 return recovered;
 }

 /**
 * @dev Returns an Ethereum Signed Message, created from a `hash`. This
 * produces hash corresponding to the one signed with the
 * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
 * JSON-RPC method as part of EIP-191.
 *
 * See {recover}.
 */
 function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
 // 32 is the length in bytes of hash,
 // enforced by the type signature above
 return keccak256(abi.encodePacked("\x19Ethereum Signed Message:
32", hash));
 }

 /**
 * @dev Returns an Ethereum Signed Message, created from `s`. This
 * produces hash corresponding to the one signed with the
 * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
 * JSON-RPC method as part of EIP-191.
 *
 * See {recover}.
 */
 function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
 return keccak256(abi.encodePacked("\x19Ethereum Signed Message:
", Strings.toString(s.length), s));
 }

 /**
 * @dev Returns an Ethereum Signed Typed Data, created from a
 * `domainSeparator` and a `structHash`. This produces hash corresponding
 * to the one signed with the
 * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
 * JSON-RPC method as part of EIP-712.
 *
 * See {recover}.
 */
 function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
 return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
 }
}

// File: @openzeppelin/contracts@4.5.0/utils/cryptography/draft-EIP712.sol


// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;


/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
 /* solhint-disable var-name-mixedcase */
 // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
 // invalidate the cached domain separator if the chain id changes.
 bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
 uint256 private immutable _CACHED_CHAIN_ID;
 address private immutable _CACHED_THIS;

 bytes32 private immutable _HASHED_NAME;
 bytes32 private immutable _HASHED_VERSION;
 bytes32 private immutable _TYPE_HASH;

 /* solhint-enable var-name-mixedcase */

 /**
 * @dev Initializes the domain separator and parameter caches.
 *
 * The meaning of `name` and `version` is specified in
 * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
 *
 * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
 * - `version`: the current major version of the signing domain.
 *
 * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
 * contract upgrade].
 */
 constructor(string memory name, string memory version) {
 bytes32 hashedName = keccak256(bytes(name));
 bytes32 hashedVersion = keccak256(bytes(version));
 bytes32 typeHash = keccak256(
 "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
 );
 _HASHED_NAME = hashedName;
 _HASHED_VERSION = hashedVersion;
 _CACHED_CHAIN_ID = block.chainid;
 _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
 _CACHED_THIS = address(this);
 _TYPE_HASH = typeHash;
 }

 /**
 * @dev Returns the domain separator for the current chain.
 */
 function _domainSeparatorV4() internal view returns (bytes32) {
 if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
 return _CACHED_DOMAIN_SEPARATOR;
 } else {
 return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
 }
 }

 function _buildDomainSeparator(
 bytes32 typeHash,
 bytes32 nameHash,
 bytes32 versionHash
 ) private view returns (bytes32) {
 return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
 }

 /**
 * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
 * function returns the hash of the fully encoded EIP712 message for this domain.
 *
 * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
 *
 * ```solidity
 * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
 * keccak256("Mail(address to,string contents)"),
 * mailTo,
 * keccak256(bytes(mailContents))
 * )));
 * address signer = ECDSA.recover(digest, signature);
 * ```
 */
 function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
 return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/draft-IERC20Permit.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
 /**
 * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
 * given ``owner``'s signed approval.
 *
 * IMPORTANT: The same issues {IERC20-approve} has related to transaction
 * ordering also apply here.
 *
 * Emits an {Approval} event.
 *
 * Requirements:
 *
 * - `spender` cannot be the zero address.
 * - `deadline` must be a timestamp in the future.
 * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
 * over the EIP712-formatted function arguments.
 * - the signature must use ``owner``'s current nonce (see {nonces}).
 *
 * For more information on the signature format, see the
 * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
 * section].
 */
 function permit(
 address owner,
 address spender,
 uint256 value,
 uint256 deadline,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) external;

 /**
 * @dev Returns the current nonce for `owner`. This value must be
 * included whenever a signature is generated for {permit}.
 *
 * Every successful call to {permit} increases ``owner``'s nonce by one. This
 * prevents a signature from being used multiple times.
 */
 function nonces(address owner) external view returns (uint256);

 /**
 * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
 */
 // solhint-disable-next-line func-name-mixedcase
 function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: @openzeppelin/contracts@4.5.0/utils/Counters.sol


// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
 struct Counter {
 // This variable should never be directly accessed by users of the library: interactions must be restricted to
 // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
 // this feature: see https://github.com/ethereum/solidity/issues/4637
 uint256 _value; // default: 0
 }

 function current(Counter storage counter) internal view returns (uint256) {
 return counter._value;
 }

 function increment(Counter storage counter) internal {
 unchecked {
 counter._value += 1;
 }
 }

 function decrement(Counter storage counter) internal {
 uint256 value = counter._value;
 require(value > 0, "Counter: decrement overflow");
 unchecked {
 counter._value = value - 1;
 }
 }

 function reset(Counter storage counter) internal {
 counter._value = 0;
 }
}

// File: @openzeppelin/contracts@4.5.0/utils/math/Math.sol


// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
 /**
 * @dev Returns the largest of two numbers.
 */
 function max(uint256 a, uint256 b) internal pure returns (uint256) {
 return a >= b ? a : b;
 }

 /**
 * @dev Returns the smallest of two numbers.
 */
 function min(uint256 a, uint256 b) internal pure returns (uint256) {
 return a < b ? a : b;
 }

 /**
 * @dev Returns the average of two numbers. The result is rounded towards
 * zero.
 */
 function average(uint256 a, uint256 b) internal pure returns (uint256) {
 // (a + b) / 2 can overflow.
 return (a & b) + (a ^ b) / 2;
 }

 /**
 * @dev Returns the ceiling of the division of two numbers.
 *
 * This differs from standard division with `/` in that it rounds up instead
 * of rounding down.
 */
 function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
 // (a + b - 1) / b can overflow on addition, so we distribute.
 return a / b + (a % b == 0 ? 0 : 1);
 }
}

// File: @openzeppelin/contracts@4.5.0/utils/Arrays.sol


// OpenZeppelin Contracts v4.4.1 (utils/Arrays.sol)

pragma solidity ^0.8.0;


/**
 * @dev Collection of functions related to array types.
 */
library Arrays {
 /**
 * @dev Searches a sorted `array` and returns the first index that contains
 * a value greater or equal to `element`. If no such index exists (i.e. all
 * values in the array are strictly less than `element`), the array length is
 * returned. Time complexity O(log n).
 *
 * `array` is expected to be sorted in ascending order, and to contain no
 * repeated elements.
 */
 function findUpperBound(uint256[] storage array, uint256 element) internal view returns (uint256) {
 if (array.length == 0) {
 return 0;
 }

 uint256 low = 0;
 uint256 high = array.length;

 while (low < high) {
 uint256 mid = Math.average(low, high);

 // Note that mid will always be strictly less than high (i.e. it will be a valid array index)
 // because Math.average rounds down (it does integer division with truncation).
 if (array[mid] > element) {
 high = mid;
 } else {
 low = mid + 1;
 }
 }

 // At this point `low` is the exclusive upper bound. We will return the inclusive upper bound.
 if (low > 0 && array[low - 1] == element) {
 return low - 1;
 } else {
 return low;
 }
 }
}

// File: @openzeppelin/contracts@4.5.0/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
 function _msgSender() internal view virtual returns (address) {
 return msg.sender;
 }

 function _msgData() internal view virtual returns (bytes calldata) {
 return msg.data;
 }
}

// File: @openzeppelin/contracts@4.5.0/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
 address private _owner;

 event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

 /**
 * @dev Initializes the contract setting the deployer as the initial owner.
 */
 constructor() {
 _transferOwnership(_msgSender());
 }

 /**
 * @dev Returns the address of the current owner.
 */
 function owner() public view virtual returns (address) {
 return _owner;
 }

 /**
 * @dev Throws if called by any account other than the owner.
 */
 modifier onlyOwner() {
 require(owner() == _msgSender(), "Ownable: caller is not the owner");
 _;
 }

 /**
 * @dev Leaves the contract without owner. It will not be possible to call
 * `onlyOwner` functions anymore. Can only be called by the current owner.
 *
 * NOTE: Renouncing ownership will leave the contract without an owner,
 * thereby removing any functionality that is only available to the owner.
 */
 function renounceOwnership() public virtual onlyOwner {
 _transferOwnership(address(0));
 }

 /**
 * @dev Transfers ownership of the contract to a new account (`newOwner`).
 * Can only be called by the current owner.
 */
 function transferOwnership(address newOwner) public virtual onlyOwner {
 require(newOwner != address(0), "Ownable: new owner is the zero address");
 _transferOwnership(newOwner);
 }

 /**
 * @dev Transfers ownership of the contract to a new account (`newOwner`).
 * Internal function without access restriction.
 */
 function _transferOwnership(address newOwner) internal virtual {
 address oldOwner = _owner;
 _owner = newOwner;
 emit OwnershipTransferred(oldOwner, newOwner);
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
 /**
 * @dev Returns the amount of tokens in existence.
 */
 function totalSupply() external view returns (uint256);

 /**
 * @dev Returns the amount of tokens owned by `account`.
 */
 function balanceOf(address account) external view returns (uint256);

 /**
 * @dev Moves `amount` tokens from the caller's account to `to`.
 *
 * Returns a boolean value indicating whether the operation succeeded.
 *
 * Emits a {Transfer} event.
 */
 function transfer(address to, uint256 amount) external returns (bool);

 /**
 * @dev Returns the remaining number of tokens that `spender` will be
 * allowed to spend on behalf of `owner` through {transferFrom}. This is
 * zero by default.
 *
 * This value changes when {approve} or {transferFrom} are called.
 */
 function allowance(address owner, address spender) external view returns (uint256);

 /**
 * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
 *
 * Returns a boolean value indicating whether the operation succeeded.
 *
 * IMPORTANT: Beware that changing an allowance with this method brings the risk
 * that someone may use both the old and the new allowance by unfortunate
 * transaction ordering. One possible solution to mitigate this race
 * condition is to first reduce the spender's allowance to 0 and set the
 * desired value afterwards:
 * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
 *
 * Emits an {Approval} event.
 */
 function approve(address spender, uint256 amount) external returns (bool);

 /**
 * @dev Moves `amount` tokens from `from` to `to` using the
 * allowance mechanism. `amount` is then deducted from the caller's
 * allowance.
 *
 * Returns a boolean value indicating whether the operation succeeded.
 *
 * Emits a {Transfer} event.
 */
 function transferFrom(
 address from,
 address to,
 uint256 amount
 ) external returns (bool);

 /**
 * @dev Emitted when `value` tokens are moved from one account (`from`) to
 * another (`to`).
 *
 * Note that `value` may be zero.
 */
 event Transfer(address indexed from, address indexed to, uint256 value);

 /**
 * @dev Emitted when the allowance of a `spender` for an `owner` is set by
 * a call to {approve}. `value` is the new allowance.
 */
 event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
 /**
 * @dev Returns the name of the token.
 */
 function name() external view returns (string memory);

 /**
 * @dev Returns the symbol of the token.
 */
 function symbol() external view returns (string memory);

 /**
 * @dev Returns the decimals places of the token.
 */
 function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
 mapping(address => uint256) private _balances;

 mapping(address => mapping(address => uint256)) private _allowances;

 uint256 private _totalSupply;

 string private _name;
 string private _symbol;

 /**
 * @dev Sets the values for {name} and {symbol}.
 *
 * The default value of {decimals} is 18. To select a different value for
 * {decimals} you should overload it.
 *
 * All two of these values are immutable: they can only be set once during
 * construction.
 */
 constructor(string memory name_, string memory symbol_) {
 _name = name_;
 _symbol = symbol_;
 }

 /**
 * @dev Returns the name of the token.
 */
 function name() public view virtual override returns (string memory) {
 return _name;
 }

 /**
 * @dev Returns the symbol of the token, usually a shorter version of the
 * name.
 */
 function symbol() public view virtual override returns (string memory) {
 return _symbol;
 }

 /**
 * @dev Returns the number of decimals used to get its user representation.
 * For example, if `decimals` equals `2`, a balance of `505` tokens should
 * be displayed to a user as `5.05` (`505 / 10 ** 2`).
 *
 * Tokens usually opt for a value of 18, imitating the relationship between
 * Ether and Wei. This is the value {ERC20} uses, unless this function is
 * overridden;
 *
 * NOTE: This information is only used for _display_ purposes: it in
 * no way affects any of the arithmetic of the contract, including
 * {IERC20-balanceOf} and {IERC20-transfer}.
 */
 function decimals() public view virtual override returns (uint8) {
 return 18;
 }

 /**
 * @dev See {IERC20-totalSupply}.
 */
 function totalSupply() public view virtual override returns (uint256) {
 return _totalSupply;
 }

 /**
 * @dev See {IERC20-balanceOf}.
 */
 function balanceOf(address account) public view virtual override returns (uint256) {
 return _balances[account];
 }

 /**
 * @dev See {IERC20-transfer}.
 *
 * Requirements:
 *
 * - `to` cannot be the zero address.
 * - the caller must have a balance of at least `amount`.
 */
 function transfer(address to, uint256 amount) public virtual override returns (bool) {
 address owner = _msgSender();
 _transfer(owner, to, amount);
 return true;
 }

 /**
 * @dev See {IERC20-allowance}.
 */
 function allowance(address owner, address spender) public view virtual override returns (uint256) {
 return _allowances[owner][spender];
 }

 /**
 * @dev See {IERC20-approve}.
 *
 * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
 * `transferFrom`. This is semantically equivalent to an infinite approval.
 *
 * Requirements:
 *
 * - `spender` cannot be the zero address.
 */
 function approve(address spender, uint256 amount) public virtual override returns (bool) {
 address owner = _msgSender();
 _approve(owner, spender, amount);
 return true;
 }

 /**
 * @dev See {IERC20-transferFrom}.
 *
 * Emits an {Approval} event indicating the updated allowance. This is not
 * required by the EIP. See the note at the beginning of {ERC20}.
 *
 * NOTE: Does not update the allowance if the current allowance
 * is the maximum `uint256`.
 *
 * Requirements:
 *
 * - `from` and `to` cannot be the zero address.
 * - `from` must have a balance of at least `amount`.
 * - the caller must have allowance for ``from``'s tokens of at least
 * `amount`.
 */
 function transferFrom(
 address from,
 address to,
 uint256 amount
 ) public virtual override returns (bool) {
 address spender = _msgSender();
 _spendAllowance(from, spender, amount);
 _transfer(from, to, amount);
 return true;
 }

 /**
 * @dev Atomically increases the allowance granted to `spender` by the caller.
 *
 * This is an alternative to {approve} that can be used as a mitigation for
 * problems described in {IERC20-approve}.
 *
 * Emits an {Approval} event indicating the updated allowance.
 *
 * Requirements:
 *
 * - `spender` cannot be the zero address.
 */
 function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
 address owner = _msgSender();
 _approve(owner, spender, _allowances[owner][spender] + addedValue);
 return true;
 }

 /**
 * @dev Atomically decreases the allowance granted to `spender` by the caller.
 *
 * This is an alternative to {approve} that can be used as a mitigation for
 * problems described in {IERC20-approve}.
 *
 * Emits an {Approval} event indicating the updated allowance.
 *
 * Requirements:
 *
 * - `spender` cannot be the zero address.
 * - `spender` must have allowance for the caller of at least
 * `subtractedValue`.
 */
 function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
 address owner = _msgSender();
 uint256 currentAllowance = _allowances[owner][spender];
 require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
 unchecked {
 _approve(owner, spender, currentAllowance - subtractedValue);
 }

 return true;
 }

 /**
 * @dev Moves `amount` of tokens from `sender` to `recipient`.
 *
 * This internal function is equivalent to {transfer}, and can be used to
 * e.g. implement automatic token fees, slashing mechanisms, etc.
 *
 * Emits a {Transfer} event.
 *
 * Requirements:
 *
 * - `from` cannot be the zero address.
 * - `to` cannot be the zero address.
 * - `from` must have a balance of at least `amount`.
 */
 function _transfer(
 address from,
 address to,
 uint256 amount
 ) internal virtual {
 require(from != address(0), "ERC20: transfer from the zero address");
 require(to != address(0), "ERC20: transfer to the zero address");

 _beforeTokenTransfer(from, to, amount);

 uint256 fromBalance = _balances[from];
 require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
 unchecked {
 _balances[from] = fromBalance - amount;
 }
 _balances[to] += amount;

 emit Transfer(from, to, amount);

 _afterTokenTransfer(from, to, amount);
 }

 /** @dev Creates `amount` tokens and assigns them to `account`, increasing
 * the total supply.
 *
 * Emits a {Transfer} event with `from` set to the zero address.
 *
 * Requirements:
 *
 * - `account` cannot be the zero address.
 */
 function _mint(address account, uint256 amount) internal virtual {
 require(account != address(0), "ERC20: mint to the zero address");

 _beforeTokenTransfer(address(0), account, amount);

 _totalSupply += amount;
 _balances[account] += amount;
 emit Transfer(address(0), account, amount);

 _afterTokenTransfer(address(0), account, amount);
 }

 /**
 * @dev Destroys `amount` tokens from `account`, reducing the
 * total supply.
 *
 * Emits a {Transfer} event with `to` set to the zero address.
 *
 * Requirements:
 *
 * - `account` cannot be the zero address.
 * - `account` must have at least `amount` tokens.
 */
 function _burn(address account, uint256 amount) internal virtual {
 require(account != address(0), "ERC20: burn from the zero address");

 _beforeTokenTransfer(account, address(0), amount);

 uint256 accountBalance = _balances[account];
 require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
 unchecked {
 _balances[account] = accountBalance - amount;
 }
 _totalSupply -= amount;

 emit Transfer(account, address(0), amount);

 _afterTokenTransfer(account, address(0), amount);
 }

 /**
 * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
 *
 * This internal function is equivalent to `approve`, and can be used to
 * e.g. set automatic allowances for certain subsystems, etc.
 *
 * Emits an {Approval} event.
 *
 * Requirements:
 *
 * - `owner` cannot be the zero address.
 * - `spender` cannot be the zero address.
 */
 function _approve(
 address owner,
 address spender,
 uint256 amount
 ) internal virtual {
 require(owner != address(0), "ERC20: approve from the zero address");
 require(spender != address(0), "ERC20: approve to the zero address");

 _allowances[owner][spender] = amount;
 emit Approval(owner, spender, amount);
 }

 /**
 * @dev Spend `amount` form the allowance of `owner` toward `spender`.
 *
 * Does not update the allowance amount in case of infinite allowance.
 * Revert if not enough allowance is available.
 *
 * Might emit an {Approval} event.
 */
 function _spendAllowance(
 address owner,
 address spender,
 uint256 amount
 ) internal virtual {
 uint256 currentAllowance = allowance(owner, spender);
 if (currentAllowance != type(uint256).max) {
 require(currentAllowance >= amount, "ERC20: insufficient allowance");
 unchecked {
 _approve(owner, spender, currentAllowance - amount);
 }
 }
 }

 /**
 * @dev Hook that is called before any transfer of tokens. This includes
 * minting and burning.
 *
 * Calling conditions:
 *
 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
 * will be transferred to `to`.
 * - when `from` is zero, `amount` tokens will be minted for `to`.
 * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
 * - `from` and `to` are never both zero.
 *
 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
 */
 function _beforeTokenTransfer(
 address from,
 address to,
 uint256 amount
 ) internal virtual {}

 /**
 * @dev Hook that is called after any transfer of tokens. This includes
 * minting and burning.
 *
 * Calling conditions:
 *
 * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
 * has been transferred to `to`.
 * - when `from` is zero, `amount` tokens have been minted for `to`.
 * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
 * - `from` and `to` are never both zero.
 *
 * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
 */
 function _afterTokenTransfer(
 address from,
 address to,
 uint256 amount
 ) internal virtual {}
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/ERC20FlashMint.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20FlashMint.sol)

pragma solidity ^0.8.0;



/**
 * @dev Implementation of the ERC3156 Flash loans extension, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * Adds the {flashLoan} method, which provides flash loan support at the token
 * level. By default there is no fee, but this can be changed by overriding {flashFee}.
 *
 * _Available since v4.1._
 */
abstract contract ERC20FlashMint is ERC20, IERC3156FlashLender {
 bytes32 private constant _RETURN_VALUE = keccak256("ERC3156FlashBorrower.onFlashLoan");

 /**
 * @dev Returns the maximum amount of tokens available for loan.
 * @param token The address of the token that is requested.
 * @return The amont of token that can be loaned.
 */
 function maxFlashLoan(address token) public view virtual override returns (uint256) {
 return token == address(this) ? type(uint256).max - ERC20.totalSupply() : 0;
 }

 /**
 * @dev Returns the fee applied when doing flash loans. By default this
 * implementation has 0 fees. This function can be overloaded to make
 * the flash loan mechanism deflationary.
 * @param token The token to be flash loaned.
 * @param amount The amount of tokens to be loaned.
 * @return The fees applied to the corresponding flash loan.
 */
 function flashFee(address token, uint256 amount) public view virtual override returns (uint256) {
 require(token == address(this), "ERC20FlashMint: wrong token");
 // silence warning about unused variable without the addition of bytecode.
 amount;
 return 0;
 }

 /**
 * @dev Performs a flash loan. New tokens are minted and sent to the
 * `receiver`, who is required to implement the {IERC3156FlashBorrower}
 * interface. By the end of the flash loan, the receiver is expected to own
 * amount + fee tokens and have them approved back to the token contract itself so
 * they can be burned.
 * @param receiver The receiver of the flash loan. Should implement the
 * {IERC3156FlashBorrower.onFlashLoan} interface.
 * @param token The token to be flash loaned. Only `address(this)` is
 * supported.
 * @param amount The amount of tokens to be loaned.
 * @param data An arbitrary datafield that is passed to the receiver.
 * @return `true` is the flash loan was successful.
 */
 function flashLoan(
 IERC3156FlashBorrower receiver,
 address token,
 uint256 amount,
 bytes calldata data
 ) public virtual override returns (bool) {
 require(amount <= maxFlashLoan(token), "ERC20FlashMint: amount exceeds maxFlashLoan");
 uint256 fee = flashFee(token, amount);
 _mint(address(receiver), amount);
 require(
 receiver.onFlashLoan(msg.sender, token, amount, fee, data) == _RETURN_VALUE,
 "ERC20FlashMint: invalid return value"
 );
 uint256 currentAllowance = allowance(address(receiver), address(this));
 require(currentAllowance >= amount + fee, "ERC20FlashMint: allowance does not allow refund");
 _approve(address(receiver), address(this), currentAllowance - amount - fee);
 _burn(address(receiver), amount + fee);
 return true;
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/draft-ERC20Permit.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-ERC20Permit.sol)

pragma solidity ^0.8.0;






/**
 * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * _Available since v3.4._
 */
abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 {
 using Counters for Counters.Counter;

 mapping(address => Counters.Counter) private _nonces;

 // solhint-disable-next-line var-name-mixedcase
 bytes32 private immutable _PERMIT_TYPEHASH =
 keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");

 /**
 * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.
 *
 * It's a good idea to use the same `name` that is defined as the ERC20 token name.
 */
 constructor(string memory name) EIP712(name, "1") {}

 /**
 * @dev See {IERC20Permit-permit}.
 */
 function permit(
 address owner,
 address spender,
 uint256 value,
 uint256 deadline,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) public virtual override {
 require(block.timestamp <= deadline, "ERC20Permit: expired deadline");

 bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline));

 bytes32 hash = _hashTypedDataV4(structHash);

 address signer = ECDSA.recover(hash, v, r, s);
 require(signer == owner, "ERC20Permit: invalid signature");

 _approve(owner, spender, value);
 }

 /**
 * @dev See {IERC20Permit-nonces}.
 */
 function nonces(address owner) public view virtual override returns (uint256) {
 return _nonces[owner].current();
 }

 /**
 * @dev See {IERC20Permit-DOMAIN_SEPARATOR}.
 */
 // solhint-disable-next-line func-name-mixedcase
 function DOMAIN_SEPARATOR() external view override returns (bytes32) {
 return _domainSeparatorV4();
 }

 /**
 * @dev "Consume a nonce": return the current value and increment.
 *
 * _Available since v4.1._
 */
 function _useNonce(address owner) internal virtual returns (uint256 current) {
 Counters.Counter storage nonce = _nonces[owner];
 current = nonce.current();
 nonce.increment();
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/ERC20Votes.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Votes.sol)

pragma solidity ^0.8.0;






/**
 * @dev Extension of ERC20 to support Compound-like voting and delegation. This version is more generic than Compound's,
 * and supports token supply up to 2^224^ - 1, while COMP is limited to 2^96^ - 1.
 *
 * NOTE: If exact COMP compatibility is required, use the {ERC20VotesComp} variant of this module.
 *
 * This extension keeps a history (checkpoints) of each account's vote power. Vote power can be delegated either
 * by calling the {delegate} function directly, or by providing a signature to be used with {delegateBySig}. Voting
 * power can be queried through the public accessors {getVotes} and {getPastVotes}.
 *
 * By default, token balance does not account for voting power. This makes transfers cheaper. The downside is that it
 * requires users to delegate to themselves in order to activate checkpoints and have their voting power tracked.
 *
 * _Available since v4.2._
 */
abstract contract ERC20Votes is IVotes, ERC20Permit {
 struct Checkpoint {
 uint32 fromBlock;
 uint224 votes;
 }

 bytes32 private constant _DELEGATION_TYPEHASH =
 keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

 mapping(address => address) private _delegates;
 mapping(address => Checkpoint[]) private _checkpoints;
 Checkpoint[] private _totalSupplyCheckpoints;

 /**
 * @dev Get the `pos`-th checkpoint for `account`.
 */
 function checkpoints(address account, uint32 pos) public view virtual returns (Checkpoint memory) {
 return _checkpoints[account][pos];
 }

 /**
 * @dev Get number of checkpoints for `account`.
 */
 function numCheckpoints(address account) public view virtual returns (uint32) {
 return SafeCast.toUint32(_checkpoints[account].length);
 }

 /**
 * @dev Get the address `account` is currently delegating to.
 */
 function delegates(address account) public view virtual override returns (address) {
 return _delegates[account];
 }

 /**
 * @dev Gets the current votes balance for `account`
 */
 function getVotes(address account) public view virtual override returns (uint256) {
 uint256 pos = _checkpoints[account].length;
 return pos == 0 ? 0 : _checkpoints[account][pos - 1].votes;
 }

 /**
 * @dev Retrieve the number of votes for `account` at the end of `blockNumber`.
 *
 * Requirements:
 *
 * - `blockNumber` must have been already mined
 */
 function getPastVotes(address account, uint256 blockNumber) public view virtual override returns (uint256) {
 require(blockNumber < block.number, "ERC20Votes: block not yet mined");
 return _checkpointsLookup(_checkpoints[account], blockNumber);
 }

 /**
 * @dev Retrieve the `totalSupply` at the end of `blockNumber`. Note, this value is the sum of all balances.
 * It is but NOT the sum of all the delegated votes!
 *
 * Requirements:
 *
 * - `blockNumber` must have been already mined
 */
 function getPastTotalSupply(uint256 blockNumber) public view virtual override returns (uint256) {
 require(blockNumber < block.number, "ERC20Votes: block not yet mined");
 return _checkpointsLookup(_totalSupplyCheckpoints, blockNumber);
 }

 /**
 * @dev Lookup a value in a list of (sorted) checkpoints.
 */
 function _checkpointsLookup(Checkpoint[] storage ckpts, uint256 blockNumber) private view returns (uint256) {
 // We run a binary search to look for the earliest checkpoint taken after `blockNumber`.
 //
 // During the loop, the index of the wanted checkpoint remains in the range [low-1, high).
 // With each iteration, either `low` or `high` is moved towards the middle of the range to maintain the invariant.
 // - If the middle checkpoint is after `blockNumber`, we look in [low, mid)
 // - If the middle checkpoint is before or equal to `blockNumber`, we look in [mid+1, high)
 // Once we reach a single value (when low == high), we've found the right checkpoint at the index high-1, if not
 // out of bounds (in which case we're looking too far in the past and the result is 0).
 // Note that if the latest checkpoint available is exactly for `blockNumber`, we end up with an index that is
 // past the end of the array, so we technically don't find a checkpoint after `blockNumber`, but it works out
 // the same.
 uint256 high = ckpts.length;
 uint256 low = 0;
 while (low < high) {
 uint256 mid = Math.average(low, high);
 if (ckpts[mid].fromBlock > blockNumber) {
 high = mid;
 } else {
 low = mid + 1;
 }
 }

 return high == 0 ? 0 : ckpts[high - 1].votes;
 }

 /**
 * @dev Delegate votes from the sender to `delegatee`.
 */
 function delegate(address delegatee) public virtual override {
 _delegate(_msgSender(), delegatee);
 }

 /**
 * @dev Delegates votes from signer to `delegatee`
 */
 function delegateBySig(
 address delegatee,
 uint256 nonce,
 uint256 expiry,
 uint8 v,
 bytes32 r,
 bytes32 s
 ) public virtual override {
 require(block.timestamp <= expiry, "ERC20Votes: signature expired");
 address signer = ECDSA.recover(
 _hashTypedDataV4(keccak256(abi.encode(_DELEGATION_TYPEHASH, delegatee, nonce, expiry))),
 v,
 r,
 s
 );
 require(nonce == _useNonce(signer), "ERC20Votes: invalid nonce");
 _delegate(signer, delegatee);
 }

 /**
 * @dev Maximum token supply. Defaults to `type(uint224).max` (2^224^ - 1).
 */
 function _maxSupply() internal view virtual returns (uint224) {
 return type(uint224).max;
 }

 /**
 * @dev Snapshots the totalSupply after it has been increased.
 */
 function _mint(address account, uint256 amount) internal virtual override {
 super._mint(account, amount);
 require(totalSupply() <= _maxSupply(), "ERC20Votes: total supply risks overflowing votes");

 _writeCheckpoint(_totalSupplyCheckpoints, _add, amount);
 }

 /**
 * @dev Snapshots the totalSupply after it has been decreased.
 */
 function _burn(address account, uint256 amount) internal virtual override {
 super._burn(account, amount);

 _writeCheckpoint(_totalSupplyCheckpoints, _subtract, amount);
 }

 /**
 * @dev Move voting power when tokens are transferred.
 *
 * Emits a {DelegateVotesChanged} event.
 */
 function _afterTokenTransfer(
 address from,
 address to,
 uint256 amount
 ) internal virtual override {
 super._afterTokenTransfer(from, to, amount);

 _moveVotingPower(delegates(from), delegates(to), amount);
 }

 /**
 * @dev Change delegation for `delegator` to `delegatee`.
 *
 * Emits events {DelegateChanged} and {DelegateVotesChanged}.
 */
 function _delegate(address delegator, address delegatee) internal virtual {
 address currentDelegate = delegates(delegator);
 uint256 delegatorBalance = balanceOf(delegator);
 _delegates[delegator] = delegatee;

 emit DelegateChanged(delegator, currentDelegate, delegatee);

 _moveVotingPower(currentDelegate, delegatee, delegatorBalance);
 }

 function _moveVotingPower(
 address src,
 address dst,
 uint256 amount
 ) private {
 if (src != dst && amount > 0) {
 if (src != address(0)) {
 (uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[src], _subtract, amount);
 emit DelegateVotesChanged(src, oldWeight, newWeight);
 }

 if (dst != address(0)) {
 (uint256 oldWeight, uint256 newWeight) = _writeCheckpoint(_checkpoints[dst], _add, amount);
 emit DelegateVotesChanged(dst, oldWeight, newWeight);
 }
 }
 }

 function _writeCheckpoint(
 Checkpoint[] storage ckpts,
 function(uint256, uint256) view returns (uint256) op,
 uint256 delta
 ) private returns (uint256 oldWeight, uint256 newWeight) {
 uint256 pos = ckpts.length;
 oldWeight = pos == 0 ? 0 : ckpts[pos - 1].votes;
 newWeight = op(oldWeight, delta);

 if (pos > 0 && ckpts[pos - 1].fromBlock == block.number) {
 ckpts[pos - 1].votes = SafeCast.toUint224(newWeight);
 } else {
 ckpts.push(Checkpoint({fromBlock: SafeCast.toUint32(block.number), votes: SafeCast.toUint224(newWeight)}));
 }
 }

 function _add(uint256 a, uint256 b) private pure returns (uint256) {
 return a + b;
 }

 function _subtract(uint256 a, uint256 b) private pure returns (uint256) {
 return a - b;
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/ERC20Snapshot.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/ERC20Snapshot.sol)

pragma solidity ^0.8.0;




/**
 * @dev This contract extends an ERC20 token with a snapshot mechanism. When a snapshot is created, the balances and
 * total supply at the time are recorded for later access.
 *
 * This can be used to safely create mechanisms based on token balances such as trustless dividends or weighted voting.
 * In naive implementations it's possible to perform a "double spend" attack by reusing the same balance from different
 * accounts. By using snapshots to calculate dividends or voting power, those attacks no longer apply. It can also be
 * used to create an efficient ERC20 forking mechanism.
 *
 * Snapshots are created by the internal {_snapshot} function, which will emit the {Snapshot} event and return a
 * snapshot id. To get the total supply at the time of a snapshot, call the function {totalSupplyAt} with the snapshot
 * id. To get the balance of an account at the time of a snapshot, call the {balanceOfAt} function with the snapshot id
 * and the account address.
 *
 * NOTE: Snapshot policy can be customized by overriding the {_getCurrentSnapshotId} method. For example, having it
 * return `block.number` will trigger the creation of snapshot at the begining of each new block. When overridding this
 * function, be careful about the monotonicity of its result. Non-monotonic snapshot ids will break the contract.
 *
 * Implementing snapshots for every block using this method will incur significant gas costs. For a gas-efficient
 * alternative consider {ERC20Votes}.
 *
 * ==== Gas Costs
 *
 * Snapshots are efficient. Snapshot creation is _O(1)_. Retrieval of balances or total supply from a snapshot is _O(log
 * n)_ in the number of snapshots that have been created, although _n_ for a specific account will generally be much
 * smaller since identical balances in subsequent snapshots are stored as a single entry.
 *
 * There is a constant overhead for normal ERC20 transfers due to the additional snapshot bookkeeping. This overhead is
 * only significant for the first transfer that immediately follows a snapshot for a particular account. Subsequent
 * transfers will have normal cost until the next snapshot, and so on.
 */

abstract contract ERC20Snapshot is ERC20 {
 // Inspired by Jordi Baylina's MiniMeToken to record historical balances:
 // https://github.com/Giveth/minimd/blob/ea04d950eea153a04c51fa510b068b9dded390cb/contracts/MiniMeToken.sol

 using Arrays for uint256[];
 using Counters for Counters.Counter;

 // Snapshotted values have arrays of ids and the value corresponding to that id. These could be an array of a
 // Snapshot struct, but that would impede usage of functions that work on an array.
 struct Snapshots {
 uint256[] ids;
 uint256[] values;
 }

 mapping(address => Snapshots) private _accountBalanceSnapshots;
 Snapshots private _totalSupplySnapshots;

 // Snapshot ids increase monotonically, with the first value being 1. An id of 0 is invalid.
 Counters.Counter private _currentSnapshotId;

 /**
 * @dev Emitted by {_snapshot} when a snapshot identified by `id` is created.
 */
 event Snapshot(uint256 id);

 /**
 * @dev Creates a new snapshot and returns its snapshot id.
 *
 * Emits a {Snapshot} event that contains the same id.
 *
 * {_snapshot} is `internal` and you have to decide how to expose it externally. Its usage may be restricted to a
 * set of accounts, for example using {AccessControl}, or it may be open to the public.
 *
 * [WARNING]
 * ====
 * While an open way of calling {_snapshot} is required for certain trust minimization mechanisms such as forking,
 * you must consider that it can potentially be used by attackers in two ways.
 *
 * First, it can be used to increase the cost of retrieval of values from snapshots, although it will grow
 * logarithmically thus rendering this attack ineffective in the long term. Second, it can be used to target
 * specific accounts and increase the cost of ERC20 transfers for them, in the ways specified in the Gas Costs
 * section above.
 *
 * We haven't measured the actual numbers; if this is something you're interested in please reach out to us.
 * ====
 */
 function _snapshot() internal virtual returns (uint256) {
 _currentSnapshotId.increment();

 uint256 currentId = _getCurrentSnapshotId();
 emit Snapshot(currentId);
 return currentId;
 }

 /**
 * @dev Get the current snapshotId
 */
 function _getCurrentSnapshotId() internal view virtual returns (uint256) {
 return _currentSnapshotId.current();
 }

 /**
 * @dev Retrieves the balance of `account` at the time `snapshotId` was created.
 */
 function balanceOfAt(address account, uint256 snapshotId) public view virtual returns (uint256) {
 (bool snapshotted, uint256 value) = _valueAt(snapshotId, _accountBalanceSnapshots[account]);

 return snapshotted ? value : balanceOf(account);
 }

 /**
 * @dev Retrieves the total supply at the time `snapshotId` was created.
 */
 function totalSupplyAt(uint256 snapshotId) public view virtual returns (uint256) {
 (bool snapshotted, uint256 value) = _valueAt(snapshotId, _totalSupplySnapshots);

 return snapshotted ? value : totalSupply();
 }

 // Update balance and/or total supply snapshots before the values are modified. This is implemented
 // in the _beforeTokenTransfer hook, which is executed for _mint, _burn, and _transfer operations.
 function _beforeTokenTransfer(
 address from,
 address to,
 uint256 amount
 ) internal virtual override {
 super._beforeTokenTransfer(from, to, amount);

 if (from == address(0)) {
 // mint
 _updateAccountSnapshot(to);
 _updateTotalSupplySnapshot();
 } else if (to == address(0)) {
 // burn
 _updateAccountSnapshot(from);
 _updateTotalSupplySnapshot();
 } else {
 // transfer
 _updateAccountSnapshot(from);
 _updateAccountSnapshot(to);
 }
 }

 function _valueAt(uint256 snapshotId, Snapshots storage snapshots) private view returns (bool, uint256) {
 require(snapshotId > 0, "ERC20Snapshot: id is 0");
 require(snapshotId <= _getCurrentSnapshotId(), "ERC20Snapshot: nonexistent id");

 // When a valid snapshot is queried, there are three possibilities:
 // a) The queried value was not modified after the snapshot was taken. Therefore, a snapshot entry was never
 // created for this id, and all stored snapshot ids are smaller than the requested one. The value that corresponds
 // to this id is the current one.
 // b) The queried value was modified after the snapshot was taken. Therefore, there will be an entry with the
 // requested id, and its value is the one to return.
 // c) More snapshots were created after the requested one, and the queried value was later modified. There will be
 // no entry for the requested id: the value that corresponds to it is that of the smallest snapshot id that is
 // larger than the requested one.
 //
 // In summary, we need to find an element in an array, returning the index of the smallest value that is larger if
 // it is not found, unless said value doesn't exist (e.g. when all values are smaller). Arrays.findUpperBound does
 // exactly this.

 uint256 index = snapshots.ids.findUpperBound(snapshotId);

 if (index == snapshots.ids.length) {
 return (false, 0);
 } else {
 return (true, snapshots.values[index]);
 }
 }

 function _updateAccountSnapshot(address account) private {
 _updateSnapshot(_accountBalanceSnapshots[account], balanceOf(account));
 }

 function _updateTotalSupplySnapshot() private {
 _updateSnapshot(_totalSupplySnapshots, totalSupply());
 }

 function _updateSnapshot(Snapshots storage snapshots, uint256 currentValue) private {
 uint256 currentId = _getCurrentSnapshotId();
 if (_lastSnapshotId(snapshots.ids) < currentId) {
 snapshots.ids.push(currentId);
 snapshots.values.push(currentValue);
 }
 }

 function _lastSnapshotId(uint256[] storage ids) private view returns (uint256) {
 if (ids.length == 0) {
 return 0;
 } else {
 return ids[ids.length - 1];
 }
 }
}

// File: @openzeppelin/contracts@4.5.0/token/ERC20/extensions/ERC20Burnable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
 /**
 * @dev Destroys `amount` tokens from the caller.
 *
 * See {ERC20-_burn}.
 */
 function burn(uint256 amount) public virtual {
 _burn(_msgSender(), amount);
 }

 /**
 * @dev Destroys `amount` tokens from `account`, deducting from the caller's
 * allowance.
 *
 * See {ERC20-_burn} and {ERC20-allowance}.
 *
 * Requirements:
 *
 * - the caller must have allowance for ``accounts``'s tokens of at least
 * `amount`.
 */
 function burnFrom(address account, uint256 amount) public virtual {
 _spendAllowance(account, _msgSender(), amount);
 _burn(account, amount);
 }
}

// File: GlobalTransactionPaymentSolution.sol


pragma solidity ^0.8.4;








contract GlobalTransactionPaymentSolution is ERC20, ERC20Burnable, ERC20Snapshot, Ownable, ERC20Permit, ERC20Votes, ERC20FlashMint {
 constructor()
 ERC20("Global Transaction Payment Solution", "GTPS")
 ERC20Permit("Global Transaction Payment Solution")
 {
 _mint(msg.sender, 472236648286964 * 10 ** decimals());
 }

 function snapshot() public onlyOwner {
 _snapshot();
 }

 function mint(address to, uint256 amount) public onlyOwner {
 _mint(to, amount);
 }

 // The following functions are overrides required by Solidity.

 function _beforeTokenTransfer(address from, address to, uint256 amount)
 internal
 override(ERC20, ERC20Snapshot)
 {
 super._beforeTokenTransfer(from, to, amount);
 }

 function _afterTokenTransfer(address from, address to, uint256 amount)
 internal
 override(ERC20, ERC20Votes)
 {
 super._afterTokenTransfer(from, to, amount);
 }

 function _mint(address to, uint256 amount)
 internal
 override(ERC20, ERC20Votes)
 {
 super._mint(to, amount);
 }

 function _burn(address account, uint256 amount)
 internal
 override(ERC20, ERC20Votes)
 {
 super._burn(account, amount);
 }
}

Contract ABI:

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