#456 - Ring-Ring (Masyu)

     Draw rectangular loops through the centers of cells so that every cell gets used. The sides of different rectangles may intersect each other, but not turn at their intersection or otherwise overlap. When a loop goes through a black circle, it must turn and travel straight through the cells on either side. When a loop goes through a white circle, it must go straight through and turn in at least one of the cells on either side.

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