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Below is a list of edges in a directed graph with nodes A,B,C,D,E,F: B → E,...

Below is a list of edges in a directed graph with nodes A,B,C,D,E,F:

B → E, B → F, C → D, D → A, E → F

a) Find 5 topological sortings of the graph.

b) Which edge must be removed in order to make ABCDEF to be a topological ordering?

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