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function repayBorrow(uint256 repayAmount) external returns (uint256);
function repayBorrowBehalf(address borrower, uint256 repayAmount) external returns (uint256);
function redeemUnderlying(uint256 redeemAmount) external returns (uint256);
function redeem(uint256 amount) external returns (uint256);
function underlying() external view returns (address);
function balanceOf(address sender) external view returns (uint256);
function balanceOfUnderlying(address sender) external returns (uint256);
function borrowBalanceStored(address sender) external view returns (uint256);