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Skyscrapers / As Easy As ABC (664)

Instruction:
Place numbers from 1-4 in some cells so that they do not repeat in rows and columns. One cell in every row and column will remain empty.
In the skyscraper puzzle the numbers represent heights of the buildings. The numbers around the grid would indicate the number of buildings you can see from the given viewpoint. The building is visible only when it is higher than all the buildings in front of it.
In the As Easy As ABC puzzle the numbers around the grid would indicate the first number visible from the given viewpoint.
The hints around the grid are sums of the Skyscraper and As Easy As ABC hints.

Reference: WPC 2018 (120)

Parent puzzle:
Skyscrapers

Child puzzles:
ABC-Sky with regional match
Related puzzles:
Easy As