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Fill in the letters shown above the frame into the grid so that each letter appears only once in every row and column. The letters around the grid indicate which letter is the first one in that row or column seen from that position. In this variant there is also one empty cell in every row and column. You can let this cell empty or put an X. 'X' is not a letter, but an empty cell. In this case a letter always means, that this letter is either in the first cell or in the second and then the first one stays empty. In this variant you also have to pay attention to the green diagonals. Each letter appears only once in each diagonal. Link: more about ABC End View
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