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import "./Clock.sol";

contract Funding {
  [...]
  
  uint public finishesAt;
  Clock clock;

  function Funding(uint _duration, address _clockAddress) public {
    owner = msg.sender;
    clock = Clock(_clockAddress);
    finishesAt = clock.getNow() + _duration;
  }

  function isFinished() public view returns (bool) {
    return finishesAt <= clock.getNow();
  }

  [...]
}