Anchor: A person performs a stunt with a bike.
Entailed: The stunt person is on a bike.
Contradiction: The stunt person is riding a skateboard.
Contradiction: The man sliced the pizza.
Contradiction: They are trying to find the most cost-effective way to limit SO2 emissions. 
Contradiction: A woman is crying near the jewelry.
Contradiction: Tuppence rose and declared that it was off.