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#938
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Hermit
A connected graph is Eulerian if and only if the degree of each of its vertices is even.
And what does the aforementioned dissected rectangle have to do with it?

Added 2 minutes later
Yuuhei
I officially declare that I don't like this topic.
But do you like this one and others by the same author?:mad:

Ничто не возникает из ничего и ничто не пропадает бесследно.
Если где-то чего-то убудет, то в другом месте добавится.

(Закон сохранения).