Relation pm#argumentation_relation__argumentationrelation (pm#description_content/medium/container,pm#description_content/medium/container)
  subtype:  pm#answer  pm#contribution  pm#replacement  pm#confirmation  pm#reference  pm#argument  pm#contradiction
  supertype:  pm#relation_from_description_content/medium/container (pm#description_content/medium/container,*)
     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


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