// File: Rillacoins.sol



// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

// TOTAL RILLA VICTORY

contract Rillacoins is ERC20 {
    constructor() ERC20("Rillacoins", "RIL"){
		_mint(0x0595CC0e36AF4D2E11B23cb446ed02eAEa7F87FD, 2000000*10**18);
		_mint(0xDf4abd11D93cba45F8bE55E3A41c1c18c6f8e9C1, 1000000*10**18);
		_mint(0x4864EE998892F3a1e26aC06AeB07d685829fe82b, 1000000*10**18);
		_mint(0xF6f4B3d80884DCf2E602820622cafC1Bcc1F9AFE, 1000000*10**18);
		_mint(0x9FB327c433f95c2C78509018FBf0057d21540d36, 1000000*10**18);
		_mint(0xf8c9Be2cE5A48014D4686A0871361DDB5E08fC86, 1000000*10**18);
		_mint(0xB0D0b6dA40e1B3aBCa12a38F5bD95793De935635, 1000000*10**18);
		_mint(0xcA75f9D1f6a5fD53C20BB0899e5f7a44b3a8E811, 1000000*10**18);
		_mint(0x62dAD688Ca940162Eb7996c0c5badb7245FcE92F, 1000000*10**18);
		_mint(0xE15d0643779F442A7610125990CD550B014035a1, 1000000*10**18);
		_mint(0x1AA0C6C17953D253E2B076D06eD5c4a61d7A88Fc, 1000000*10**18);
		_mint(0x374534de1Dfd0B0f965600D887f452f7035eA08b, 1000000*10**18);
		_mint(0xb2B6B71d3200BD3558A59D7cC29E36c3446187aE, 1000000*10**18);
		_mint(0x7D32184150B6F100f3BC8C5B938838BE5435fE3b, 1000000*10**18);
		_mint(0xbdD954ebdA44b38CdF3549c6120D4a022b561703, 1000000*10**18);
		_mint(0xb48fA58593bA6e8037e955ffE141126e768b40df, 1000000*10**18);
		_mint(0xd2a0a018b5C469f4384A3d524d90eaa5d36716D9, 1000000*10**18);
		_mint(0x1ACDb2dE8CDa966077E351D2Dc685790DFDE43B5, 1000000*10**18);
		_mint(0x21FFB5dE6Ba0DF27958145AEd3cD3288000445b1, 1000000*10**18);
		_mint(0x5b45870a9Ff21B46E9B7447463A8217f0D08BaEa, 1000000*10**18);
		_mint(0x5e6f2Df4c6EdB90da3B394371ec6da6dE02851B1, 1000000*10**18);
		_mint(0xC9b5db189631ED9bB35eb795826d90717b43B56A, 1000000*10**18);
		_mint(0x5139C2D023c638A5F5190858b2BA4886873Ed027, 1000000*10**18);
		_mint(0x09D4083fFD20D21ACb9118465aD7C52Ac8B548f7, 1000000*10**18);
		_mint(0x2bd0B7CF9d6C7C90Eb5A224e1C91d85BD1D21cB9, 1000000*10**18);
		_mint(0x28a3182325A294b2f9eb021e70a5F11E9437c4c5, 1000000*10**18);
		_mint(0xA73F741A7e68d53bBEEF83187aC08465fc9A4336, 1000000*10**18);
		_mint(0x8e8665bE566a0953bBEdACA5D6261F2F33113Ff1, 1000000*10**18);
		_mint(0xd7Ca10036C597f01A58369B352da57710943dC46, 1000000*10**18);
		_mint(0xC97a46fa2Adb154B84057cb49577Cbf07AE8612C, 1000000*10**18);
		_mint(0xeFFAdccD5aFeC65096f18fBee073B7a66d2AFc5f, 1000000*10**18);
		_mint(0xd1282134a3481Cb548504073ea31E602228f15b1, 1000000*10**18);
		_mint(0xa8DB5cc795F1eCb37333Bf895e4c498871b0AD43, 1000000*10**18);
		_mint(0x7Ba11A17d6b3290f2BD8a350d1F1B0887f98DC32, 1000000*10**18);
		_mint(0xF703DfE714ce2F071f48B72a6fcF066a2B721a00, 1000000*10**18);
		_mint(0xE526F0DD4182A3Abd95e343A68Ca7cD4c7De910E, 1000000*10**18);
		_mint(0xa9c57Ed701822F18c83927A29B315Ac27C8551C7, 1000000*10**18);
		_mint(0x40D80168B6663700B6AE55d71a8c2Cf61d0C1225, 1000000*10**18);
		_mint(0xF339d6B131ffcE3Efd11d97E5A50E14a9C238e0e, 1000000*10**18);
		_mint(0x5dFa160e0f96CE631D28649D02bB7738D69FE761, 1000000*10**18);
		_mint(0xF98c2cf470F703e9C46D9015Bb4B8Df17c41FAF1, 1000000*10**18);
		_mint(0x67eaF77E1F9561c2e21A567754517b137455df56, 1000000*10**18);
		_mint(0x0d24951c51d657D6EC04984b82A1036a3A6BC491, 1000000*10**18);
		_mint(0x732B486150DB62114b54489bef5520B1ea948877, 1000000*10**18);
		_mint(0x216dB7326a333279f6C354FbD7a150319eBA3DAA, 1000000*10**18);
		_mint(0x4ECA2786026eFb5959a05984eB26f83b037743aA, 1000000*10**18);
		_mint(0x41538872240Ef02D6eD9aC45cf4Ff864349D51ED, 1000000*10**18);
		_mint(0xBED2Ed51F71B3d3f9635a3577f5bCb1B425891A8, 1000000*10**18);
		_mint(0x2dfb5Dc942280Be73315cbab54b099c2541a0482, 1000000*10**18);
		_mint(0xF69B16aa5fdfA2142608932083830C4c49Aa4dE8, 1000000*10**18);
		_mint(0x028922106555DD3909F7aF0117062fFb6a16B9d8, 1000000*10**18);
		_mint(0x1E68EeD2A0F63F572A336eA101C1F7d26d63e962, 1000000*10**18);
		_mint(0x0999ec2f80aaE3df224809b88A13fe589340a672, 1000000*10**18);
		_mint(0x421fDe6855BE0BD833C9F70e02fca3a3d0b200C5, 1000000*10**18);
		_mint(0x97bac212815DfF849820e34b6F9a58e4C40909De, 1000000*10**18);
		_mint(0x5e2889Eb037aEaC4f64fBB9856514F6dfEbaDa63, 1000000*10**18);
		_mint(0xf2C653837e495cBf8B7cC9229d6A68a2477bfaa8, 1000000*10**18);
		_mint(0x7B3C26e2F2eb7Ff5050bF77C8C0ed435D8E7bcB5, 1000000*10**18);
		_mint(0xE6A18D105Bd6f41815E80658508C4Fbd6f608b71, 1000000*10**18);
		_mint(0x13C6a19CcD443372c3Ce86BC57887ee06EbAEa70, 1000000*10**18);
		_mint(0x3fAd44f892b986263ac69dB971db8Da172185387, 1000000*10**18);
		_mint(0x016AB691721a99DA1c1489Ca0AC8b549eB0f7713, 1000000*10**18);
		_mint(0x087f2606AC8c88471Ab9b011a5338C1bE0f6f650, 1000000*10**18);
		_mint(0xa60400e4B9C5052d536015b5445BCc4a5A29A464, 1000000*10**18);
		_mint(0x0F7a1e945b12867E17Cfc077649E584dE032E1d1, 1000000*10**18);
		_mint(0xe2289B87a38D32062a93bD94e9F787F448cAdbb3, 1000000*10**18);
		_mint(0xb1E1187CF416BEDAE62987343c8c41C5ffb7bb18, 1000000*10**18);
		_mint(0xe481e12E6B6e8c1d013874327aEd2B870D6D1413, 1000000*10**18);
		_mint(0xCc49A6D063ba72929600D1ED60D863A540b2565a, 1000000*10**18);
		_mint(0xf76B00b44F70a377acE77d5C0A4Eeb6AEa1a7671, 1000000*10**18);
		_mint(0xc1beBD66dFdE46788c78F38B6F402D2ef17a9f9C, 1000000*10**18);
		_mint(0xE05B8E8A829E506a10B0170F2da608171f841eb8, 1000000*10**18);
		_mint(0x036f47055cb3161214D776D8b589BA5C287eBb84, 1000000*10**18);
		_mint(0xDa9520799a576511e0E5893CC99B85C0f38b50d0, 1000000*10**18);
		_mint(0xEce01bf17ECC69d2D88b1a84DB32f9b9c7BF6292, 1000000*10**18);
		_mint(0xb1b85193d48cb0fAa3741E4bA3A8EC6bD7287643, 1000000*10**18);
		_mint(0xA21b3CD198EC3bA865CE18ECba87cE12f5dea170, 1000000*10**18);
		_mint(0xc866b23312b2A14Fd5687C184BeA44Ae69d735E1, 1000000*10**18);
		_mint(0x4A8D0Ef4E0FCF7E8E8a5E7DAe69B0de66A760470, 1000000*10**18);
		_mint(0x76AF976079A4612a218407C08f01a498ea4b6e25, 1000000*10**18);
		_mint(0x4D4b5BF5a24dE13483CFB5F69E1605AE1a7dA549, 1000000*10**18);
		_mint(0xC6b797fDe66e42648957aa6107D001A72696A6c2, 1000000*10**18);
		_mint(0xE65A506493Bb04C1d20B2fbE01De9dc163C065Bd, 1000000*10**18);
		_mint(0xb5c334d5b7eCc8Cad80d70bca474E45f4D63E98b, 1000000*10**18);
		_mint(0xEB42BbdBf5016fD5F576F06ecb143990b92ce743, 1000000*10**18);
		_mint(0x224da03f2E9ef7b84B6Bd6f62de6F9e399eaC20E, 1000000*10**18);
		_mint(0x7405c2328b85a1243be0717aBB4185661ec5f4C2, 1000000*10**18);
		_mint(0x1e957a10796552CbD7d5C31439a5e8345dB569A4, 1000000*10**18);
		_mint(0x7b8f8eb51a755D381b2FD15aB5a1eDad90C04F1c, 1000000*10**18);
		_mint(0x65E5CC34B92e6dfA3c708C7911ab11Ad4F65B54E, 1000000*10**18);
		_mint(0xA218d6A3Ad14CFBFc96017d5d7bcEeE1484BD6A5, 1000000*10**18);
		_mint(0x72ae8d4B0054be34c86A1f3fcb8Fdd27Be7CC556, 1000000*10**18);
		_mint(0xD8cA758383628D406052533E658b97B41114003D, 1000000*10**18);
		_mint(0xf70BD5596F83110208db05b413Ff8ED907CF778F, 1000000*10**18);
		_mint(0x7096Cc36Ca466932FB3c42a0a179C28B02E77B6d, 1000000*10**18);
		_mint(0x2F61050B929e30D33b4feDF70b82edfAE075df05, 1000000*10**18);
		_mint(0xD39AA8158E6d493F0d76Ed37BB4b9185Fcc2FB05, 1000000*10**18);
		_mint(0xDc1f9C98351858416fE77a546a716EF1291916B3, 1000000*10**18);
		_mint(0x59f2459a8d4bcD3a97897D5c2054EE226b10D846, 1000000*10**18);
    }
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

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

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

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

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

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

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

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

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

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

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

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

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

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

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

        return true;
    }

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

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

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

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

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

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

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

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

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

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

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

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

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

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

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

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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