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Curious Cheetah

Sum-Skyscrpaers

Background

This is related to Skyscrapers and ABC Path. Like ABC Path (and unlike Skyscrapers), there can be some blank squares.

Puzzle and Goal

An unsolved puzzle consists of a square with numbers on each side.
The goal is to place numbers in the squares.

Rules

The solved grid must satisfy the following conditions:

Other Names

Summen-Hochhäuser; Summen-Wolkenkratzer; Sum-Skyline