Relation sumo#line_measure ()
  type:  pm#binary_predicate_type  the class of predicates relating two items - its valence is two
  type:  pm#total_valued_relation_type  when there exists an assignment for the last argument position of the relation given any assignment of values to every argument position except the last one; note that declaring a relation to be both a total_valued_relation and a single_valued_relation means that it is a total function


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