public TupleCombinerBuilder once( TupleRef... tupleRefs)
    {
    for( TupleRef tupleRef : tupleRefs)
      {
      tupleCombiner_.addOnceTuple( tupleRef);
      }
    return this;
    }
public TupleCombinerBuilder once ( TupleRef ... tupleRefs ) { for ( TupleRef tupleRef : tupleRefs ) { tupleCombiner_ . addOnceTuple ( tupleRef ) ; } return this ; }
Adds the given once-only tuples to this combiner.