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Slitherlink (Tetrominoes) (1236)
Instruction:
Draw some loops that only consist of line segments between the dots along the dashed lines. Different loops cannot share dots. A number inside a cell indicates how many of the edges of that cell are part of the loop.
Each loop must have the shape of a tetromino. No two loops may be shaped like the same tetromino; rotations and reflections are considered the same shape.