@two_star This seems up your alley. OP wants a covering of an 8×8 array with a monomino and 21 trominoes of three colors, such that no trominoes of the same color share any edge, and only one pair of the same color shares a vertex.
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@two_star This seems up your alley. OP wants a covering of an 8×8 array with a monomino and 21 trominoes of three colors, such that no trominoes of the same color share any edge, and only one pair of the same color shares a vertex.