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function DOMAIN_SEPARATOR() external view returns (bytes32);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function balanceOf(address account) external view returns (uint256);
function decimals() external view returns (uint8);
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
function getStETHByWstETH(uint256 wstETHAmount) external view returns (uint256);
function getWstETHByStETH(uint256 stETHAmount) external view returns (uint256);
function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
function name() external view returns (string memory);
function nonces(address owner) external view returns (uint256);
function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
external;
function stETH() external view returns (address);
function stEthPerToken() external view returns (uint256);
function symbol() external view returns (string memory);
function tokensPerStEth() external view returns (uint256);
function totalSupply() external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
function unwrap(uint256 wstETHAmount) external returns (uint256);
function wrap(uint256 stETHAmount) external returns (uint256);