exerciser.PartitionsTests Node1 exerciser.PartitionsTests + __init__() + make_helper_tool() + logfile_name() - _make_chain_dict() Node2 exerciser.CombinationsTests + n_sgnl + n_bkgd + bkgd_etmax + chain_name + __init__() + make_chain_dict() + make_helper_tool() + make_event_generator() + logfile_name() Node2->Node1 Node3 object Node3->Node2