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2. List of traditional card and tile packs - Wikipedia

   en.wikipedia.org/wiki/List_of_traditional_card...

   Tiles and cards can be inscribed with a single letter or character for each tile/card. These tiles/cards can each be duplicated any number of times, at different frequencies, depending on the objective of the game set being produced. Anagrams is a traditional word game that can be played with any set of alphabet cards or tiles.

3. Mutilated chessboard problem - Wikipedia

   en.wikipedia.org/wiki/Mutilated_chessboard_problem

   The puzzle is impossible to complete. A domino placed on the chessboard will always cover one white square and one black square. Therefore, any collection of dominoes placed on the board will cover equal numbers of squares of each color. But any two opposite squares have the same color: both black or both white.

4. Euclidean tilings by convex regular polygons - Wikipedia

   en.wikipedia.org/wiki/Euclidean_tilings_by...

   Following Grünbaum and Shephard (section 1.3), a tiling is said to be regular if the symmetry group of the tiling acts transitively on the flags of the tiling, where a flag is a triple consisting of a mutually incident vertex, edge and tile of the tiling. This means that, for every pair of flags, there is a symmetry operation mapping the first ...