interface IProofOfHumanity {
    
    /** @dev Return true if the submission is registered and not expired.
     *  @param _submissionID The address of the submission.
     *  @return Whether the submission is registered or not.
     */
    function isRegistered(address _submissionID) external view returns (bool);
    
    /** @dev Return the number of submissions irrespective of their status.
     *  @return The number of submissions.
     */
    function submissionCounter() external view returns (uint);
    
}
function submissionCounter() external view returns (uint);

/** @dev Return the number of submissions irrespective of their status.
 *  @return The number of submissions.
 */