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Catholic Univ Louvain, Inst Rech Math & Phys, Chemin Cyclotron 2 Bte L7-01-02, B-1348 Louvain La Neuve, Belgium;
Inst Politecn Leiria, Ctr Desenvolvimento Rapido & Sustentado Prod, Escola Super Tecnol & Gestao, Dept Matemat, P-2411901 Leiria, Portugal;
Univ Coimbra, CMUC, P-3001501 Coimbra, PortugalUniv Siena, Dept Informat Engn & Math Sci, DIISM, I-53100 Siena, Italy;
Ideal; clot; zero-class; surjective left split relation; pointed exact Mal'tsev category; Smith is Huq condition;