interface ERC165 {

  /**
   * @notice Query if a contract implements an interface
   * @param _interfaceId The interface identifier, as specified in ERC-165
   * @dev Interface identification is specified in ERC-165. This function
   * uses less than 30,000 gas.
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool);
}
/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool);
/**
 * @notice Query if a contract implements an interface
 * @param _interfaceId The interface identifier, as specified in ERC-165
 * @dev Interface identification is specified in ERC-165. This function
 * uses less than 30,000 gas.
 */