TaskPropPat Propagator patterns Gecode::UnaryPropagator Gecode::BinaryPropagator Gecode::TernaryPropagator Gecode::NaryPropagator Gecode::NaryOnePropagator Gecode::MixBinaryPropagator Gecode::MixTernaryPropagator Gecode::MixNaryOnePropagator