Anchor:  "Don't know.
Entailed: I do not know. 
Contradiction: I know for sure. 
Contradiction: There's a couple of credible, the four letter word for vagina is used regularly in polite conversation, and the slang expression for those who engage in oral sex is acceptable in the office.
Contradiction: The struggle is going to continue for a little while longer.
Contradiction: Two white dogs are playing in the snow.
Contradiction: A blond woman is talking on the phone.