Anchor: A car would do it in half an hour. 
Entailed: An automobile would be able to do that within 30 minutes.
Contradiction: We would not be able to do that with a car.
Contradiction: A guy with no shirt on is harrassing women.
Contradiction: A man on a bus.
Contradiction: A runner is using the bathroom at a port-a-potty.
Contradiction: Some non-popular scientists have come out saying CFC's may not be the main problem.