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Multiply union families in Nn |
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| Institution: | 1. Alfréd Rényi Institute of Mathematics, H-1364 Budapest, P.O.Box 127, Hungary;2. Faculty of Education, Shiga University, 2-5-1 Hiratsu, Shiga 520-0862, Japan;3. College of Education, Ryukyu University, Nishihara, Okinawa 903-0213, Japan |
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