Anchor: They prevent high-cost mailers from being cross subsidized by low-cost mailers, and they
Entailed: High cost mailers are stopped from being subsidized by low cost mailers
Contradiction: High cost mailers are subsidized by low cost ones 
Contradiction: It was too hot for there to be snow on the ground.
Contradiction: The man is holding a baby.
Contradiction: The worker is wearing a blue hard hat.
Contradiction: A man is descending a rock face.