[pm#graph1_on_substance
     [any #substance (^$(no inheritance)$^),
          pm#matter of: a pm#physical_entity,
          pm#matter: a #substance,
          pm#physical_part of: a pm#physical_entity,
          pm#physical_part: a pm#physical_entity,
          menu#physical_characteristic (^$(explore 2)$^): a menu#physical_characteristic,
          #monetary_value: a #monetary_value,
          may be pm#object of: a pm#commercial_transaction (^$(explore 1)$^),
          may be pm#object/result of (^$(explore)$^): a pm#process]
];