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Coded Coral (586)
Instruction:
Shade some cells black such that the blackened cells form a standard WPC-style “coral”: All black cells are connected orthogonally, all other cells are connected orthogonally to the outer edges of the grid, and no 2×2 area is entirely blackened. “Numbers” below and to the right represent the lengths of segments of consecutively-blackened cells in that row or column, but in no particular order. The actual numbers have been substituted with letters such that the same letter always represents the same number and different letters represent different numbers. (Only numbers greater than 0 are used.)