Problem #9


Given a set of dominoes [1:1],[1:2],...[1,n],[2,2],[2,3],...[n:n] with no repeated tiles, a domino circle is an ordered set [a1:a2], [a2:a3],..., [ak−1:ak] with a1 = ak. For example if n=3 and k=6,[1:1],[1:2],[2:2],[2:3],[3:3],[3:1] is a domino circle.

The solution will be posted shortly.

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