Anchor: I think I used to live in a twenty-one B.
Entailed: I used to live in 21-B, if I remember correctly.
Contradiction: I never lived in 21-B, ever.
Contradiction: We know without a doubt that Peter's House is authentic.
Contradiction: The man was inspecting the building front
Contradiction: The man is taking a science exam.
Contradiction: Eligible aliens have special legal issues.