while ( sem.count > 0 && q1x.getAnswer() == null && q20.getAnswer() == null ) {
                    sem.wait();
                }
            }
        }
        catch ( InterruptedException ie ) {
            throw new UnknownHostException(name);
        }
        waitForQueryThreads(q1x, q20);
        if ( q1x.getAnswer() != null ) {
            return q1x.getAnswer();
        }