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Semitransparent snake (691)
Instruction:
Draw a snake in the grid. The snake goes from cell to cell vertically or horizontally, but not diagonally. The snake does not touch itself, not even diagonally. The numbers outside the grid indicate how many squares are used by the snake in that row or column.
In this puzzle however every time the snake goes 4 or more cells in a straight line (counting from Start) every fourth cell along that line is invisible and is not counted.