Anchor: I've known him slightly on and off for some years, and this morning I ran across him in the street.
Entailed: I bumped into him in the street.
Contradiction: I've known him for some years, but haven't seen him for a few months.
Contradiction: A dog is eating its last meal before bedtime.
Contradiction: There is a big rock that several people are climbing.
Contradiction: The effects of one day of exposure was overestimated in the study.
Contradiction: The dog is outdoors.