Disallowed As Easy As ABC

Disallowed As easy as ABCD

Fill the grid with the letters A, B, C and D. Each row and column has exactly one of each letter and two empty cells. The clues along the edges tell you which first letter you can see from that vantage point. Letters with a red cross say that you can't see this letter as first.

Disallowed As easy as ABCD

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