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A combinatorial problem. (Russian. English original) Zbl 0196.02803
Kibern. Sb., Nov. Ser. 6, 33-40 (1969); translation from Nederl. Akad. Wet., Proc., Ser. A 49, 758-764 (1946).
See the review of the original in Zbl 0060.02701.

Keywords:
combinatorics
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