Question: Make a 3-by-3 chart with row and column labels WHITE, GRAY, and BLACK. In each cell (I, j), indicate whether, at any point during a

Make a 3-by-3 chart with row and column labels WHITE, GRAY, and BLACK. In each cell (I, j), indicate whether, at any point during a depth-first search of a directed graph, there can be an edge from a vertex of color i to a vertex of color j. For each possible edge, indicate what edge types it can be. Make a second such chart for depth-first search of an undirected graph.

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