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Hexa skyscrapers (675)

Instruction:
Place numbers from 1 to 7 in all the empty cells of the grid so that they do not repeat in any of the 21 rows in the three directions. The numbers represent the heights of building. Numbers around the grid indicate how many buildings are visible in the given direction. Lower buildings behind higher buildings are not visible.

Reference: WPC 2018 (120)

Parent puzzle:
Skyscrapers