KöMaL 2019 K622
The 16 tokens in the game of QUARTO are all different from each other in some property. The tokens can be categorized into two sets of the same number of elements in four different ways: - tall or flat; - black or white; - round or square; - with or without a hole on the top. Is it possible to arrange the 16 tokens in a circle so that adjacent ones should have exactly two properties in common?
Official text KöMaL. Quoted with source.
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