Anchor: His hard shell, in fact, was one of the problems I had when writing my book.
Entailed: I had a problem with his hard shell when I wrote my book.
Contradiction: Of all the problems I had when writing my book, his hard shell was not one of them.
Contradiction: A girl plays with legos.
Contradiction: There are two dogs running.
Contradiction: the man is standing
Contradiction: Some women are walking outside.