Anchor: You will remember my speaking of a stain on the carpet in Mrs. Inglethorp's room? 
Entailed: There was a stain on the carpet in Mrs. Inglethorp's room. 
Contradiction: There was no stain on Mrs. Inglethorp's pristine carpet. 
Contradiction: I have nothing to say.
Contradiction: The cold and flus are horrible here.
Contradiction: A boy is taking a test.
Contradiction: two dogs are playing in a field