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Snail End View Untouchable (714)
Instruction:
Place letters A,B,C,D in the grid so that each letters appears exactly once in every row and column. The same letters may not touch each other not even diagonally. Reading the letters from the top left corner entrance and going to the center the same sequence must repeat.
The order of the sequence is for you to determine.The letters around the grid denote the second letter visible from the given direction in the given row or column. (Cells with X cannot contain letters).
Notes:The name is a bit strange: "Snail Second View Untouchable" would be better.