Relation sumo#disjoint (sumo#set_or_class,sumo#set_or_class)  classes are exclusive/disjoint only if they share no instance (and hence no subtype), i.e. just in case the result of applying sumo#intersection_fn to them is empty
  related_to:  sumo#disjoint_decomposition  sumo#disjoint_relation
  type:  pm#binary_predicate_type  the class of predicates relating two items - its valence is two
  supertype:  pm#disjoint (pm#set_or_class,pm#set_or_class)  like sumo#disjoint but from a a pm#set_or_class to another
     supertype:  pm#relation_to_another_set_or_class (pm#set_or_class,pm#set_or_class+)  this category is needed to group SUMO relations between classes which cannot be subtype of pm#relation_from_type because their signatures curiously also involve sets
        supertype:  pm#relation_between_collections (pm#collection,pm#collection+)
           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
                 >part of:  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 
                    >part of:  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 (*)
        supertype:  pm#relation_to_set_or_class (*,pm#set_or_class)
           supertype:  pm#relation_to_collection (*,pm#collection)


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