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contract Coin {
    function isApprovedFor(address _target, address _proxy) constant returns (bool _r) {}
    function isApproved(address _proxy) constant returns (bool _r) {}
    function sendCoinFrom(address _from, uint256 _val, address _to) {}
    function coinBalanceOf(address _a) constant returns (uint256 _r) {}
    function sendCoin(uint256 _val, address _to) {}
    function coinBalance() constant returns (uint256 _r) {}
    function approve(address _a) {}
}