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Yin-Yang (No Swiss) (1002)
Instruction:
Fill each cell with either a black or a white circle. All cells with black circles must be connected orthogonally, and all cells with white circles must be connected orthogonally. Every 2×2 group of cells must contain at least one black circle and at least one white circle. Some cells are already filled in for you.
Every Swiss cross-shaped arrangement of five cells must contain at least one black circle and at least one white circle.