Recurrence relations for the number of labeled structures on a finite set
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The Specker--Blatter theorem does not hold for quaternary relations
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COCOON'03 Proceedings of the 9th annual international conference on Computing and combinatorics
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WoLLIC'10 Proceedings of the 17th international conference on Logic, language, information and computation
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The aim of this paper is to point to a difference between binary and hyperary structures. The modular counting functions of a class of structures defined by a sentence of second-order monadic logic with equality, based on binary relations, are ultimately periodic. However, this is not the case for sentences based on quaternary relations.