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2. (3 points) Let f be a valid flow in a flow network (no edge points to s and no edges leaves t ). Prove

2. (3 points) Let f be a valid flow in a flow network (no edge points to s and no edges leaves t ). Prove that fout(s)=fin(t). You may use val(f)=fout(A)fin(A) for every cut (A,B)

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