Consider the following relation. R1 = {(1, 1), (1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (2, 4), (3, 3), (3, 4), (4, 4)} Considering the above scenario and draw the graph and find whether it is graph or tree. If it's a graph whether it is directed, undirected, weighted or un-weighted graph. If not then why it's not. Explain your answer by your own.

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