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( b ) ( 20 points ) In formulating flow problems , we assume that there is at most one directed edge between any two

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( b ) ( 20 points ) In formulating flow problems , we assume that there is at most one directed edge between any two nodes . Suppose we have a network with multi- edges . now there may be be multiple directed edges going from node i to node j , each possibly with and D different capacities and weights . Show how to reduce this problem to the standard one without multi- edges

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