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Dotchi Loop (1253)
Instruction:
Draw a single loop that passes orthogonally through centers of cells. The loop cannot go through any cell with a black square. The loop must go through all cells with a white circle. The loop cannot intersect itself or enter the same cell more than once. For each region, either the loop must go straight through all white circles in that region, or the loop must turn at every white circle in that region.