Relation pm#relation_between_collections (pm#collection,pm#collection+)
  subtype:  pm#sub_collection  pm#sub_collection_of  pm#overlapping_collection  pm#not_overlapping_collection  kif#rest  kif#append  sumo#list_concatenate_fn  kif#revappend  kif#reverse  pm#relation_from_type_to_collection  pm#relation_to_another_set_or_class  pm#relation_to_another_ontology
  supertype:  pm#relation_from_collection (pm#collection,*)
     supertype:  pm#relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence
          offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
        supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
     supertype:  pm#what_relation (*)
        supertype:  pm#wh-/how_relation (*)  this type permits to categorize relations according to the usual who/what/why/where/when/how questions ; this is a traditional but very subjective and ineffective way of categorizing relations 
           supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type
  supertype:  pm#relation_to_collection (*,pm#collection)
     supertype:  pm#relation_from/to_thing_of_common_kind (*)  this type permits to categorize relations according to their signatures and hence
          offers (i) a concise way to set essential exclusion relations, and (ii) a systematic and easy-to-follow categorization
     supertype:  pm#what_relation (*)


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