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Afternoon Skyscrapers (582)
Instruction:
Place a digit from 1 to 7 into each cell (1 to 4 in the example), so that each digit appears exactly once in each row and column. The digits represent skyscrapers of different heights (of unit height equal to the width of a cell). The darkened “shadows” along the left and bottom edges of the cell indicate that the building in that cell is unlit by sunshine when the sun is at the west or at the south, respectively.