2. Let s, t be distinct vertices of a digraph G, and let c : E(G) → Z+.
Let φ be a c-admissible s - t ?ow of value k and suppose there is a c-admissible ?ow with value > k. Does it follow that there is a c- admissible ?ow ψ of value > k so that φ(e) ≤ ψ(e) for every edge e?