[pm#graph1_on_time_measure
     [any pm#time_measure,
          may be pm#time of: a pm#situation,
          may be pm#duration of: a pm#situation,
          may have for pm#inferior_to: a pm#time_measure,
          may be pm#inferior_to of: a pm#time_measure,
          may have for pm#inferior_or_equal_to: a pm#time_measure,
          may be pm#inferior_or_equal_to of: a pm#time_measure]
];