6. (8%) Let G=(V, Ej be a directed graph where V represents vertices, and E represents edges. E = {(2, 1), (3, 2), (2, 3), (1,4), (2, 4), (3, 1), (3, 4)). Each pair (i, j) in E means that there is an arc from node i to node j. Please draw the directed graph and write in-degree and out-degree of each vertex