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ABC-Box (568)
Instruction:
Place exactly one letter from the set {A, B, C} into each cell. (Cells may not remain empty.) Symbols outside the grid indicate all groups of continuous cells with the same letter along that row or column. The symbols are given in the same order as their corresponding groups. If a symbol is a number, it indicates the length of that group in cells; if a symbol is a letter, it indicates the letter in the cells for that group. If a symbol is a “?” (question mark), then no extra information about the group is given beyond its existence.