Text: It has been pointed out by the American co-authors of this paper that a post could rationalize its delivery costs by reducing the frequency of service on unprofitable routes to the point where they become profitable (Cohen et al.
Entailment: It was pointed out by the co-authors that the post could rationalize the delivery costs by lowering the frequency of service on bad routes.
Contradiction: The co-authors said delivery costs wouldn't benefit if they lowered delivery on any routes.