Relation pm#ternary_relation__ternaryrelation__ternary_only_relation (?,?,?)  relation with a fixed arity equal to 3; specialized by the SUMO ternary relations not categorized elsewhere
  exclusion:  pm#binary_relation  pm#quaternary_relation  pm#relation_with_variable_arity
  subtype:  pm#binary_function {sumo#confers_norm sumo#deprives_norm}
  supertype:  pm#relation_with_particular_property (*)  this rather fuzzy type permits to group categorization schemes less common than those covered by the previous sibling categories
     supertype:  pm#relation__related_thing__relatedthing___related_with (*)  type for any relation (unary, binary, ..., *-ary) and instance of pm#relation_type


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