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I need some help with this problem, I try to prove that all vertices of $G$ is in a cycle by I can't prove it. Can you help me?

Let $G$ be a connected and bipartite graph and $G$ is regular of grade $k>1$, prove that $G$ is a biconnected graph.

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marked as duplicate by JMoravitz, clark, Rebecca J. Stones, Smylic, Namaste Jun 5 '17 at 17:41

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