Flat forest
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Flat forest --- плоский лес.
A. flat forest of a graph [math]\displaystyle{ G = (V,E) }[/math] is a forest [math]\displaystyle{ F = (V,E') }[/math] such that [math]\displaystyle{ E' \subset E }[/math] and each tree in [math]\displaystyle{ F }[/math] has height at most 1. Any zero-degree node in [math]\displaystyle{ G }[/math] is zero-degree in [math]\displaystyle{ F }[/math], too.