<commit_before>import java.util.List;

final class HandshakeCalculator {

    List<Signal> calculateHandshake(int number) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

}
<commit_msg>remove final from class declaration in secret-handshake exercise<commit_after>import java.util.List;

class HandshakeCalculator {

    List<Signal> calculateHandshake(int number) {
        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
    }

}

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