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Contract Name:
Mutantz

Contract Source Code:

File 1 of 1 : Mutantz

// Sources flattened with hardhat v2.9.3 https://hardhat.org

// File @openzeppelin/contracts/utils/introspection/[email protected]

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
/**
 * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
/**
 * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

/**
 * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

/**
 * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

/**
 * @dev Returns the number of tokens in ``owner``'s account.
     */
function balanceOf(address owner) external view returns (uint256 balance);

/**
 * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
function ownerOf(uint256 tokenId) external view returns (address owner);

/**
 * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;

/**
 * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
function transferFrom(
address from,
address to,
uint256 tokenId
) external;

/**
 * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
function approve(address to, uint256 tokenId) external;

/**
 * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
function getApproved(uint256 tokenId) external view returns (address operator);

/**
 * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
function setApprovalForAll(address operator, bool _approved) external;

/**
 * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
function isApprovedForAll(address owner, address operator) external view returns (bool);

/**
 * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
/**
 * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}


// File @openzeppelin/contracts/token/ERC721/extensions/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
/**
 * @dev Returns the token collection name.
     */
function name() external view returns (string memory);

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

/**
 * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
function tokenURI(uint256 tokenId) external view returns (string memory);
}


// File @openzeppelin/contracts/utils/[email protected]

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

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
/**
 * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.

return account.code.length > 0;
}

/**
 * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");

(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}

/**
 * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}

/**
 * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");

(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");

(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}

/**
 * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");

(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}

/**
 * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly

assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}


// File @openzeppelin/contracts/utils/[email protected]

// 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/utils/[email protected]

// 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/utils/introspection/[email protected]

// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
/**
 * @dev See {IERC165-supportsInterface}.
     */
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}


// File @openzeppelin/contracts/token/ERC721/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;







/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
using Address for address;
using Strings for uint256;

// Token name
string private _name;

// Token symbol
string private _symbol;

// Mapping from token ID to owner address
mapping(uint256 => address) private _owners;

// Mapping owner address to token count
mapping(address => uint256) private _balances;

// Mapping from token ID to approved address
mapping(uint256 => address) private _tokenApprovals;

// Mapping from owner to operator approvals
mapping(address => mapping(address => bool)) private _operatorApprovals;

/**
 * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}

/**
 * @dev See {IERC165-supportsInterface}.
     */
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
return
interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
super.supportsInterface(interfaceId);
}

/**
 * @dev See {IERC721-balanceOf}.
     */
function balanceOf(address owner) public view virtual override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _balances[owner];
}

/**
 * @dev See {IERC721-ownerOf}.
     */
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}

/**
 * @dev See {IERC721Metadata-name}.
     */
function name() public view virtual override returns (string memory) {
return _name;
}

/**
 * @dev See {IERC721Metadata-symbol}.
     */
function symbol() public view virtual override returns (string memory) {
return _symbol;
}

/**
 * @dev See {IERC721Metadata-tokenURI}.
     */
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

string memory baseURI = _baseURI();
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
}

/**
 * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
function _baseURI() internal view virtual returns (string memory) {
return "";
}

/**
 * @dev See {IERC721-approve}.
     */
function approve(address to, uint256 tokenId) public virtual override {
address owner = ERC721.ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");

require(
_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);

_approve(to, tokenId);
}

/**
 * @dev See {IERC721-getApproved}.
     */
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");

return _tokenApprovals[tokenId];
}

/**
 * @dev See {IERC721-setApprovalForAll}.
     */
function setApprovalForAll(address operator, bool approved) public virtual override {
_setApprovalForAll(_msgSender(), operator, approved);
}

/**
 * @dev See {IERC721-isApprovedForAll}.
     */
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}

/**
 * @dev See {IERC721-transferFrom}.
     */
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

_transfer(from, to, tokenId);
}

/**
 * @dev See {IERC721-safeTransferFrom}.
     */
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}

/**
 * @dev See {IERC721-safeTransferFrom}.
     */
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}

/**
 * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}

/**
 * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}

/**
 * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}

/**
 * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}

/**
 * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}

/**
 * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");

_beforeTokenTransfer(address(0), to, tokenId);

_balances[to] += 1;
_owners[tokenId] = to;

emit Transfer(address(0), to, tokenId);

_afterTokenTransfer(address(0), to, tokenId);
}

/**
 * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);

_beforeTokenTransfer(owner, address(0), tokenId);

// Clear approvals
_approve(address(0), tokenId);

_balances[owner] -= 1;
delete _owners[tokenId];

emit Transfer(owner, address(0), tokenId);

_afterTokenTransfer(owner, address(0), tokenId);
}

/**
 * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
require(to != address(0), "ERC721: transfer to the zero address");

_beforeTokenTransfer(from, to, tokenId);

// Clear approvals from the previous owner
_approve(address(0), tokenId);

_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;

emit Transfer(from, to, tokenId);

_afterTokenTransfer(from, to, tokenId);
}

/**
 * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}

/**
 * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
function _setApprovalForAll(
address owner,
address operator,
bool approved
) internal virtual {
require(owner != operator, "ERC721: approve to caller");
_operatorApprovals[owner][operator] = approved;
emit ApprovalForAll(owner, operator, approved);
}

/**
 * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver.onERC721Received.selector;
} catch (bytes memory reason) {
if (reason.length == 0) {
revert("ERC721: transfer to non ERC721Receiver implementer");
} else {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}

/**
 * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` 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 tokenId
) 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.
     * - `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 tokenId
) internal virtual {}
}


// File @openzeppelin/contracts/token/ERC721/extensions/[email protected]

// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
/**
 * @dev Returns the total amount of tokens stored by the contract.
     */
function totalSupply() external view returns (uint256);

/**
 * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

/**
 * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
function tokenByIndex(uint256 index) external view returns (uint256);
}


// File @openzeppelin/contracts/token/ERC721/extensions/[email protected]

// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;


/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;

// Array with all token ids, used for enumeration
uint256[] private _allTokens;

// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;

/**
 * @dev See {IERC165-supportsInterface}.
     */
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}

/**
 * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
return _ownedTokens[owner][index];
}

/**
 * @dev See {IERC721Enumerable-totalSupply}.
     */
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}

/**
 * @dev See {IERC721Enumerable-tokenByIndex}.
     */
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
return _allTokens[index];
}

/**
 * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual override {
super._beforeTokenTransfer(from, to, tokenId);

if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}

/**
 * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}

/**
 * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}

/**
 * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).

uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];

// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}

// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}

/**
 * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).

uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];

// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];

_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}


// File @openzeppelin/contracts/security/[email protected]

// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
/**
 * @dev Emitted when the pause is triggered by `account`.
     */
event Paused(address account);

/**
 * @dev Emitted when the pause is lifted by `account`.
     */
event Unpaused(address account);

bool private _paused;

/**
 * @dev Initializes the contract in unpaused state.
     */
constructor() {
_paused = false;
}

/**
 * @dev Returns true if the contract is paused, and false otherwise.
     */
function paused() public view virtual returns (bool) {
return _paused;
}

/**
 * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
modifier whenNotPaused() {
require(!paused(), "Pausable: paused");
_;
}

/**
 * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
modifier whenPaused() {
require(paused(), "Pausable: not paused");
_;
}

/**
 * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
function _pause() internal virtual whenNotPaused {
_paused = true;
emit Paused(_msgSender());
}

/**
 * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
function _unpause() internal virtual whenPaused {
_paused = false;
emit Unpaused(_msgSender());
}
}


// File @openzeppelin/contracts/access/[email protected]

// 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/utils/[email protected]

// 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 contracts/Mutantz.sol

pragma solidity ^0.8.7;
abstract contract Microbes {
function tokenOfOwnerByIndex(address owner, uint256 index) external virtual view returns (uint256);

function safeTransferFrom(address from, address to, uint256 tokenId) external virtual;

function approve(address to, uint256 tokenId) external virtual;

function ownerOf(uint256 tokenId) external virtual view returns (address);

function balanceOf(address owner) external virtual view returns (uint256 balance);

function burnToken(uint256 tokenId) public virtual;
}

abstract contract Trooprz {
function ownerOf(uint256 tokenId) external virtual view returns (address);
}

contract Mutantz is ERC721Enumerable, Pausable, Ownable {
Microbes private microbes;
Trooprz private trooprz;
using Counters for Counters.Counter;
Counters.Counter private _tokenIds;

// Maximum tokens will be 2222
uint256 public  _totalSupply = 2222;

address burnerAddress = 0xAbe9c4bA987dA10523b5B3cA5823B547a72f6cce;

mapping(address => uint256) public _spawnCount;
mapping(uint256 => bool) public TokenIds;

bool public _spawnActive = false;
uint256 public _maxMint = 5;

string public _prefixURI;

event SetBaseURI(string newURI);
event AirDrop(address[] indexed addrs);
event ToggleSpawnActive(bool claimActive);
event Spawn(address indexed addr, uint256[] microbes_ids, uint256[] ogTroopr_ids, address senderAddress);
event ToggleTransferPause(bool paused);
event UpdateTotalSupply(uint256 newMax);
event UpdateBurnerAddress(address newAddress);
event Withdraw(uint256 amount);

constructor() ERC721("Mutantz", "MTNTZ") {
microbes = Microbes(0xbabdFDD5f88035C9FbA58Be1b5c76DcFC6A847f3);
trooprz = Trooprz(0x51112Bf32B9a1C64716DF2e6b82e63a04Bd384Fd);
}

function _baseURI() internal view override returns (string memory) {
return _prefixURI;
}

function setBaseURI(string memory _uri) public onlyOwner {
_prefixURI = _uri;
emit SetBaseURI(_uri);
}

function airDrop(address[] memory addrs) public onlyOwner {
require(addrs.length > 0, "need addresses to airdrop to");
require(_tokenIds.current() + addrs.length <= _totalSupply, "can't airdrop more than available");
for (uint256 i = 0; i < addrs.length; i++) {
_mintItem(addrs[i]);
}
emit AirDrop(addrs);
}

function toggleSpawnActive() public onlyOwner {
_spawnActive = !_spawnActive;
emit ToggleSpawnActive(_spawnActive);
}

function checkIfOGTrooprUsedBefore(uint256[] memory tokenIds) public view returns (bool) {
bool usedBefore = false;
for (uint256 i = 0; i < tokenIds.length; i++) {
if (TokenIds[tokenIds[i]]) {
usedBefore = true;
}
}
return usedBefore;
}

function deleteFromList(uint256 _tokenId) public onlyOwner {
delete TokenIds[_tokenId];
}

function checkIfListsAreNotEmpty(uint256[] memory microbesIds, uint256[] memory trooprIds) public pure returns (bool) {
if (microbesIds.length > 0 && trooprIds.length > 0) {
return true;
}
return false;
}

function calculateAmountOfGoldenMicrobes(uint256[] memory microbesIds) public pure returns (uint256) {
uint256 amountOfGoldenMicrobes = 0;
for (uint256 i = 0; i < microbesIds.length; i++) {
if (microbesIds[i] <= 222) {
amountOfGoldenMicrobes = amountOfGoldenMicrobes + 1;
}
}
return amountOfGoldenMicrobes;
}

function calculateAmountOfRegularMicrobes(uint256[] memory microbesIds) public pure returns (uint256) {
uint256 amountOfRegularMicrobes = 0;
for (uint256 i = 0; i < microbesIds.length; i++) {
if (microbesIds[i] > 222) {
amountOfRegularMicrobes = amountOfRegularMicrobes + 1;
}
}
return amountOfRegularMicrobes;
}

function checkIfAmountOfMicrobesAndTrooprzIsCorrect(uint256[] memory microbesIds, uint256[] memory trooprzIds) public pure returns (bool) {
uint256 amountOfGoldenMicrobes = calculateAmountOfGoldenMicrobes(microbesIds);
uint256 amountOfRegularMicrobes = calculateAmountOfRegularMicrobes(microbesIds);

if (amountOfGoldenMicrobes == trooprzIds.length - (amountOfRegularMicrobes / 4) && amountOfRegularMicrobes == ((trooprzIds.length - amountOfGoldenMicrobes) * 4)) {
return true;
}
return false;

}

function checkIfCallerIsOwnerOfMicrobes(uint256[] memory tokenIds) public view returns (bool) {
bool isOwner = false;
address sender = msg.sender;
for (uint256 i = 0; i < tokenIds.length; i++) {
if (!(microbes.ownerOf(tokenIds[i]) == sender)) {
isOwner = false;
break;
}
else {
isOwner = true;
}
}
return isOwner;
}

function checkIfCallerIsOwnerOfOGTrooprz(uint256[] memory tokenIds) public view returns (bool) {
bool isOwner = false;
address sender = msg.sender;
for (uint256 i = 0; i < tokenIds.length; i++) {
if (!(trooprz.ownerOf(tokenIds[i]) == sender)) {
isOwner = false;
break;
}
else {
isOwner = true;
}
}
return isOwner;
}

function spawn(uint256[] memory microbes_ids, uint256[] memory ogTroopr_ids, address senderAddress) public {
address sender = msg.sender;
require(_spawnActive, "spawn is not active");
require(checkIfListsAreNotEmpty(microbes_ids, ogTroopr_ids), "can't send empty lists");
require(checkIfAmountOfMicrobesAndTrooprzIsCorrect(microbes_ids, ogTroopr_ids), "must send four Microbes per OG Troopr or one golden microbe per OG Troopr");
require(checkIfCallerIsOwnerOfMicrobes(microbes_ids), "Must own the Microbes used for spawn");
require(checkIfCallerIsOwnerOfOGTrooprz(ogTroopr_ids), "Must own the OG Troopr used for spawn");
require(!checkIfOGTrooprUsedBefore(ogTroopr_ids), "Troopr token has been used before");
uint256 totalSpawned = _tokenIds.current();
require(totalSpawned + ogTroopr_ids.length <= _totalSupply, "sold out");
_spawnCount[sender] = _spawnCount[sender] + ogTroopr_ids.length;
for (uint256 i = 0; i < ogTroopr_ids.length; i++) {
_mintItem(msg.sender);
}
for (uint256 i = 0; i < microbes_ids.length; i++) {
uint256 tokenToSend = microbes_ids[i];
microbes.safeTransferFrom(senderAddress, burnerAddress, tokenToSend);
}
for (uint256 i = 0; i < ogTroopr_ids.length; i++) {
TokenIds[ogTroopr_ids[i]] = true;
}
emit Spawn(sender, microbes_ids, ogTroopr_ids, senderAddress);
}

function _mintItem(address to) internal {
_tokenIds.increment();
uint256 id = _tokenIds.current();
_safeMint(to, id);
}

function toggleTransferPause() public onlyOwner {
paused() ? _unpause() : _pause();
emit ToggleTransferPause(paused());
}

function updateTotalSupply(uint256 newSupply) external onlyOwner {
require(newSupply > 0, "new supply can not be 0");
_totalSupply = newSupply;
emit UpdateTotalSupply(newSupply);
}

function updateBurnerAddress(address newAddress) external onlyOwner {
burnerAddress = newAddress;
emit UpdateBurnerAddress(newAddress);
}

function withdraw() external onlyOwner {
require(address(this).balance > 0);
uint256 balance = address(this).balance;
payable(msg.sender).transfer(balance);
emit Withdraw(balance);
}
}

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