Anchor: Since many mailers have computerized mailing systems in place and have sufficient volume, they can do presorting work at a very low cost.
Entailed: There are some mailers who can presort at low cost.
Contradiction: It is not possible for mailers to do presorting at low cost.
Contradiction: A group of adults are sleeping.
Contradiction: There are people.
Contradiction: a man in black is sitting on a bench
Contradiction: The ice skaters are around the corner