The symmetric difference graph of two graphs G1 = (V, E1) and G2 = (V, E2) on the samevertex set is defined as G1△G2 := (V, E1△E2). Remember that E1△E2 := (E1 \ E2) ∪(E2 \ E1). If G1 and G2 are eulerian, show that every vertex in G1△G2 has even degree

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