Anchor: A mysterious knock had brought Tuppence to the door of the apartment she was sharing with the American girl.
Entailed: Tuppence did not live alone in her apartment.
Contradiction: Tuppence ignored the knock on her door as she assumed that was just her Brazilian room mate. 
Contradiction: The Postal Service has delivered more pieces of advertising in 1900
Contradiction: Two people cleaning a pool
Contradiction: One person is sitting
Contradiction: A man is performing on the street.