assertEquals( 2, x.size() );
assertTrue( x.contains( "Q" ) );
assertTrue( x.contains( "Thing" ) );
b = parseBitSet( "1111" );
x = encoder.upperAncestors(b);
System.out.println( "ANC " + x );
assertEquals( 6, x.size() );
assertTrue( x.contains( "A" ) );
assertTrue( x.contains( "Z" ) );