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Let G 1 and G 2 be planar graphs. 1) For any two edges e 1 E(G 1 ) and e 2 E(G 2 ),

Let G₁and G₂ be planar graphs. 1) For any two edges e₁ image text in transcribed E(G₁) and e₂E(G₂), let G be the graph obtained from G₁ and G₂by identifying e₁ and e₂. Show that G is planar. 2) For any two triangles T₁G₁ and T2G₂, let G' be the graph obtained from G₁ and G₂ by identifying T₁ and T₂. Is G' still planar?

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