Anchor: Tommy walked across to the writing-table, and opened the middle drawer.
Entailed: The drawer that Tommy opened was the middle one.
Contradiction: Tommy only opened the top drawer and not the middle one.
Contradiction: Oh, Monsieur Poirot is not around.
Contradiction: A couple are enjoying themselves.
Contradiction: The Grand Bazaar is closed on Mondays.
Contradiction: People are outside.