2 let h be any graph and let h be the graph with v h v h u v for some
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2. Let H be any graph, and let H' be the graph with V(H') = V(H) U {v} for some vertex v not in V(H), and E(H') = E(H). For each positive integer n and graph H, find ex(n, H') in terms of ex(n, H). ex is extremal