BG-MO 1978 Problem 3
On the name day of a man there are people. The men observed that of any people there are that knows each other. Prove that the man may order his guests around circular table in such way that every man have on its both side people that he knows.
N. Nenov, N. Hazhiivanov
Dataset text AI-MO AoPS. Quoted with source.
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