In each of the following cases, either draw a picture of the graph which matches the information, or explain why no such graph exists. • G1 with 4 vertices, each of degree 2; • G2 with 5 vertices, each of degree 3; • G3 with 6 vertices, of which 2 of degree 1, 4 of degree 2; • G4 with 5 vertices, of which 1 of degree 1, 2 of degree 2, 2 of degree 4.

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