Anchor: A street performer with a guitar entertains a group of people at night.
Entailed: A musician performs for the night life crowd.
Contradiction: A musician restrings his guitar.
Contradiction: The Romans never built anything in the town.
Contradiction: someone in black with a hat stands high up
Contradiction: The carbon dioxide the visitors produced did not damage the walls at all.
Contradiction: I have noticed that technical literature mentions both metric units and the English equivalent.