Relation pm#relation_from_situation_to_situation (situation,situation)
  exclusion:  relation_from_situation_to_time  relation_from_time_to_situation  relation_to_time  temporal_relation
  supertype:  relation_from_situation  relation_to_situation  when_relation
  subtype:  later_situation__latersituation (situation,situation)
     subtype:  next_situation (situation -> situation)
        subtype:  successor (situation -> situation)
     subtype:  ending_situation__termination (situation -> situation)
     subtype:  postcondition (process,situation)
     subtype:  consequence (situation,situation)  see also rst#effect
  subtype:  before_situation (situation,situation)  in WebKB, do not use these relations, use their inverses
     subtype:  previous_situation (situation -> situation)
     subtype:  beginning_situation__beginningsituation (situation -> situation)
     subtype:  precondition (process,situation)
     subtype:  cause (situation,situation)  see also rst#cause
        subtype:  causes (process,process)  the process in the 1st argument brings about the process in the 2nd argument