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Snail End View (713)
Instruction:
Place letters A,B,C in the grid so that each letter appears exactly once in every row, column and main diagonal. The letters have to follow the sequence A,B,C,A,B,C,… starting at the top left corner entrance and going to the center of the snail. The letters around the grid denote the second letter visible from the given direction in the given row, column or diagonal.
Notes:The name is a bit strange: "Snail Second View" would be better.