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Yin-Yang Slitherlink (530)
Instruction:
Draw a single, non-intersecting loop that only consists of horizontal and vertical segments between the dots. A number inside a cell indicates how many of the edges of that cell are part of the loop.
All cells outside the loop must be connected orthogonally. Every 2×2 group of cells must contain at least one cell inside the loop and one cell outside the loop.