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References:
[1] P. GORALČÍK: Problem. Coll. Math. Soc. J. Bolyai 17, Contribution to universal algebra, North Holland, 1977, p. 604,
[2] B. JÓNSS0N: Topics in universal algebra. Springer-Verlag, Berlin - Heidelberg - New York 1972. MR 0345895
[3] P. P. PÁLFY: On certain congruence lattices of finite unary algebras. Comment. Math. Univ. Carolinae 19 (1978), 88-95. MR 0472656
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