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03763924 Asatryan, O.S. On positive equivalences. Dokl. Akad. Nauk Arm. SSR 71, 136-140 (1980). 1980 Izdatel'stvo Akademii Nauk Armyanskoj SSR, Erevan RU Post enumeration n-universality equivalence relations precompletely enumerated set precompleteness Zbl 0374.02027