Anchor: A skater rides his board on a ramp.
Entailed: A skater on a ramp.
Contradiction: A girl drives a jetski around the lake.
Contradiction: Oh why don't you do any work?
Contradiction: Yugoslavia refused to allow the UN official to investigate the country. 
Contradiction: Alfred Inglethorp was silent and refused to speak to anyone.
Contradiction: There are prepared estimates of welfare gains.