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The PairExPair relation. The PairExPair relation is a specialisation of the PartOf relation and contributes as such to the definition of the partonomic hierarchy of TAH.The PairExPair relation is a link between a father material singular unpaired entity and a child immaterial singular paired entity, which is a boundary surface. Its target is the definition of a symmetrical pair of surfaces out of an unpaired material entity.In this relation, the dimension of the father and child may vary with the condition that the dimension of the father is greater or equal to the dimension of the child. See specifc examples under P1EU. and P2EU. Name:PairExPairAcronym: PEUConceptual schema: [Child entity A] -> (PairExPair) -> [Father entity B]Child entity A: immaterial singular paired surfaceFather entity B: material singular paired.
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