Let A be as in Lemma 7.2.4. Prove that there exist two x-adjacent (for some entity x)

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Let A be as in Lemma 7.2.4. Prove that there exist two x-adjacent

(for some entity x) neighbors A0,A1 ∈ A such that D0 = (A0) is 0-valent, and D1 = (A1) is 1-valent.

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