#19 - Tetrochain
Rules: Shade some tetrominoes of cells such that no two tetrominoes touch each other orthogonally, but all tetrominoes form one diagonally connected network. Two tetrominoes of the same shape may not touch diagonally, counting rotations and reflections as the same. Clues cannot be shaded, and represent the number of shaded cells in a straight line in the indicated direction.
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