Anchor: Students are outside of a dorm building having a water fight.
Entailed: Students are having a water fight.
Contradiction: Students are at a party drinking inside.
Contradiction: While the price of computers sky-rocketed, the auto industry has trended towards cheaper and cheaper.
Contradiction: There were twelve children in my large family.  
Contradiction: The adult and the child are swimming.
Contradiction: A man is outside.