7. Let G be a connected 5-regular planar graph. Prove that the number of faces of G is congruent to 2 (mod 3)
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7. Let G be a connected 5-regular planar graph. Prove that the number of faces of G is congruent to 2 (mod 3)
7. Let G be a connected 5-regular planar graph. Prove that the number of faces of G is congruent to 2 (mod 3)
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