4.) Determine whether there is a graph with the given conditions. In each case, if such graph, or explain why no graph exists, either draw the graph exists. Such 1.) A graph with degree sequence (4,3,2,2, 2, 1). 2.) A simple graph with degree sequence (4,4,3,3,1). 3.) A digraph with in-degree (3, 1, 1, 1) and out-degree (0,2,2,2) (u 4.) A tree with deares

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