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Inner ABC (750)
Instruction:
Place letters A, B, C in the white cells in the grid, so that in every row and every column every letter occurs exactly once (not counting the letters in grey cells); in every row and every column some cells remain empty. The letters in gray cells indicate only the letters that are visible from the given cell both horizontally and vertically. You can see only the first letter in each of the 4 directions. Gray cells are considered invisible.