final Map<Object, RightTuple> previousMatches = (Map<Object, RightTuple>) leftTuple.getObject();
final Map<Object, RightTuple> newMatches = new HashMap<Object, RightTuple>();
leftTuple.setObject( newMatches );
betaConstraints.updateFromTuple( context,
wm,
leftTuple );
FastIterator rightIt = LinkedList.fastIterator;
for ( final java.util.Iterator< ? > it = dataProvider.getResults( leftTuple,