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Heavy Dots (247)
Instruction:
Draw vertical/horizontal lines along the dashed lines to divide the grid into regions. A region may contain at most one number, equal to the area of the region. No region may cover a 2×2 area. Some dots are “heavy” and have 3 or 4 lines connected to them. Black dots indicate heavy dots with exactly three lines; white dots indicate heavy dots with exactly four lines. Not all heavy dots are given, but there can be no heavy dots one cell-edge away from the indicated ones.