This sum is even (14), but can not find the graph. because it does not exist?
2026-04-01 21:59:23.1775080763
Is there a simple graph with five vertices of degrees 1, 2, 3, 4, 4?
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Hint: If two vertices have degree 4, can any vertex have degree 1?
More generally, the Havel-Hakimi Algorithm decides when a given sequence of numbers is realized by a graph.