Map<Columns, Integer> input = new HashMap<Columns, Integer>( households );
assertEquals( households, input );
Map<Columns,Integer> result = new HashMap<Columns, Integer>();
while( true )
{
Columns type = consume(input, URandomService.getURandomService(),
null);
if( type == null ) {
break;
}
if( ! result.containsKey( type )) {