Relation pm#relation_from_a_world (world,*)
  subtype:  concept_in_Dolce_Full  relation_in_Dolce_Full
  supertype:  relation_using_a_world_as_argument (world,*)
     supertype:  relation_with_particular_property (*)  this rather fuzzy type permits to group categorization schemes less common than those covered by the previous sibling categories
        >part of:  relation__related_thing__relatedthing___related_with  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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