}
        waitForQueryThreads(q1x, q20);
        if ( q1x.getAnswer() != null ) {
            return q1x.getAnswer();
        }
        else if ( q20.getAnswer() != null ) {
            return q20.getAnswer();
        }
        else {
            throw q1x.getException();
        }
    }


    private static void waitForQueryThreads ( QueryThread q1x, QueryThread q20 ) {