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Abba (522)
Instruction:
Place letters into some cells (no more than one letter per cell) such that each row, each column, and each region contains exactly two ‘A’s and two ‘B’s. Every region is also a path, and the letters “ABBA” must appear, in that order, along the path, possibly with empty spaces between them. (The route of the path will be clear from the bolded edges.) Some letters may already be filled in for you.