If a network has several sources s 1 , , s k , show that
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If a network has several sources s1, · · ·, sk, show that it can be reduced to the case of a single-source network by introducing a new vertex s and connecting s to s1, · · ·, sk, by k edges of capacity ∞. Similarly if there are several sinks. Illustrate this idea by a network with two sources and two sinks.
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