Anchor: Poirot was sitting by the table, his head buried in his hands. 
Entailed: Sitting by a table with his head in his hands was Poirot.
Contradiction: Sitting on the table eating lunch was Poirot.
Contradiction: The men are sitting on a couch.
Contradiction: The man dressed in gray was standing outside of an ice cream cart
Contradiction: The four men walked around the city.
Contradiction: A young man is on rollerskates.