// File: Address.sol



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

pragma solidity ^0.8.0;

/**
 * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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: Context.sol



// SPDX-License-Identifier: MIT
// 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: ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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: ERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165.sol";

/**
 * @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);
	}

	/**
	 * @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);
	}

	/**
	 * @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 of token that is not own"
		);
		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);
	}

	/**
	 * @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 {}
}

// File: ERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "./ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @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: IERC165.sol



// 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: IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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: IERC721Enumerable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";

/**
 * @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 tokenId);

	/**
	 * @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: IERC721Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";

/**
 * @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: IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// 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: NuppoDogWorld.sol



// SPDX-License-Identifier: GPL-3.0
/*
                                                                                        
                                                                                        
NNNNNNNN        NNNNNNNNDDDDDDDDDDDDD        WWWWWWWW                           WWWWWWWW
N:::::::N       N::::::ND::::::::::::DDD     W::::::W                           W::::::W
N::::::::N      N::::::ND:::::::::::::::DD   W::::::W                           W::::::W
N:::::::::N     N::::::NDDD:::::DDDDD:::::D  W::::::W                           W::::::W
N::::::::::N    N::::::N  D:::::D    D:::::D  W:::::W           WWWWW           W:::::W 
N:::::::::::N   N::::::N  D:::::D     D:::::D  W:::::W         W:::::W         W:::::W  
N:::::::N::::N  N::::::N  D:::::D     D:::::D   W:::::W       W:::::::W       W:::::W   
N::::::N N::::N N::::::N  D:::::D     D:::::D    W:::::W     W:::::::::W     W:::::W    
N::::::N  N::::N:::::::N  D:::::D     D:::::D     W:::::W   W:::::W:::::W   W:::::W     
N::::::N   N:::::::::::N  D:::::D     D:::::D      W:::::W W:::::W W:::::W W:::::W      
N::::::N    N::::::::::N  D:::::D     D:::::D       W:::::W:::::W   W:::::W:::::W       
N::::::N     N:::::::::N  D:::::D    D:::::D         W:::::::::W     W:::::::::W        
N::::::N      N::::::::NDDD:::::DDDDD:::::D           W:::::::W       W:::::::W         
N::::::N       N:::::::ND:::::::::::::::DD             W:::::W         W:::::W          
N::::::N        N::::::ND::::::::::::DDD                W:::W           W:::W           
NNNNNNNN         NNNNNNNDDDDDDDDDDDDD                    WWW             WWW            
                                                                                        
                                                                                        
*/

pragma solidity >=0.7.0 <0.9.0;

import "./ERC721Enumerable.sol";
import "./Ownable.sol";

contract NuppoDogWorld is ERC721Enumerable, Ownable {
	using Strings for uint256;

	string public baseURI;
	string public baseExtension = ".json";
	uint256 public cost = 0.03 ether;
	uint256 public maxSupply = 3333;
	uint256 public maxMintAmount = 100;
	uint256 public nftPerAddressLimit = 100;
	bool public paused = false;
	mapping(address => uint256) public addressMintedBalance;

	constructor(
		string memory _name,
		string memory _symbol,
		string memory _initBaseURI
	) ERC721(_name, _symbol) {
		setBaseURI(_initBaseURI);
	}

	// internal
	function _baseURI() internal view virtual override returns (string memory) {
		return baseURI;
	}

	// public
	function mint(address _to, uint256 _mintAmount) public payable {
		require(!paused, "the contract is paused");
		uint256 supply = totalSupply();
		require(!paused);
		require(_mintAmount > 0, "need to mint at least 1 NFT");
		require(
			_mintAmount <= maxMintAmount,
			"max mint amount per session exceeded"
		);
		require(supply + _mintAmount <= maxSupply, "max NFT limit exceeded");

		if (msg.sender != owner()) {
			uint256 ownerMintedCount = addressMintedBalance[msg.sender];
			require(
				ownerMintedCount + _mintAmount <= nftPerAddressLimit,
				"max NFT per address exceeded"
			);
			require(msg.value >= cost * _mintAmount, "insufficient funds");
		}

		for (uint256 i = 1; i <= _mintAmount; i++) {
			addressMintedBalance[msg.sender]++;
			_safeMint(_to, supply + i);
		}
	}

	function walletOfOwner(address _owner)
		public
		view
		returns (uint256[] memory)
	{
		uint256 ownerTokenCount = balanceOf(_owner);
		uint256[] memory tokenIds = new uint256[](ownerTokenCount);
		for (uint256 i; i < ownerTokenCount; i++) {
			tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
		}
		return tokenIds;
	}

	function tokenURI(uint256 tokenId)
		public
		view
		virtual
		override
		returns (string memory)
	{
		require(
			_exists(tokenId),
			"ERC721Metadata: URI query for nonexistent token"
		);

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

	function setCost(uint256 _newCost) public onlyOwner {
		cost = _newCost;
	}

	function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
		maxMintAmount = _newmaxMintAmount;
	}

	function setBaseURI(string memory _newBaseURI) public onlyOwner {
		baseURI = _newBaseURI;
	}

	function setBaseExtension(string memory _newBaseExtension)
		public
		onlyOwner
	{
		baseExtension = _newBaseExtension;
	}

	function pause(bool _state) public onlyOwner {
		paused = _state;
	}

	function withdraw() public payable onlyOwner {
		(bool os, ) = payable(owner()).call{value: address(this).balance}("");
		require(os);
	}
}

// File: Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "./Context.sol";

/**
 * @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: Strings.sol



// SPDX-License-Identifier: MIT
// 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);
    }
}