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