Anchor: Two young boys roll down a grassy hill.
Entailed: Two boys roll down a hill.
Contradiction: Two boys are running up a sandy hill.
Contradiction: As soon as I got out my clothing melted from the heat.
Contradiction: It's expensive to keep alive a baby born in the 22nd week.
Contradiction: Two men are sitting in a cafe, watching tv.
Contradiction: Someone is swinging.