Anchor: A skateboarder gets airtime.
Entailed: A skateboarder is airborne.
Contradiction: A biker bunny-hopping off a ledge.
Contradiction: This is  a huge deal that will change everyone's lives for good.
Contradiction: A group of people gather near a body of water.
Contradiction: You will be warmly welcomed by all clerks even if you are poorly dressed.
Contradiction: The subsystems didn't pass the first ground and environmental tests.