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Regional masyu (739)
Instruction:
Draw a single loop using only horizontal and vertical lines between the centers of some cells such that the loop does not visit any cell more than once. At every cell containing a white circle the loop must pass straight through that circle and make a 90 degree turn in at least one of the cells adjacent to the circle. At every cell containing a black circle the loop must make a 90 degree turn and travel straight through both cells adjacent to the circle.
Each outlined region contains exactly 4 turns of the loop.