(Euler graph) An EllIeI' graph G is a graph that has a
Chapter 23, Problem 23.2(choose chapter or problem)
(Euler graph) An EllIeI' graph G is a graph that has a clo:-.ed Euler trail. An Euler trail is a trail that contains every edge of G exactly once. Which subgraph with four edges of the graph in Example I, Sec. 23.1. is an Euler graph?
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