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Masyu (blackened, alternating) (941)
Instruction:
Draw a single, non-intersecting loop that passes orthogonally through all circled cells. The loop must go straight through the cells with white circles, with a turn in at least one of the cells immediately before or after each white circle. The loop must make a turn in all the black circles, but must go straight in both cells immediately before and after each black circle.
The positions of the circles are provided, but you must determine which circles are black and which circles are white.
The colors of circles alternate along the loop (black-white-black-white...).