Anchor: Four teenage boys sit on concrete in front of a sign.
Entailed: There are four people in this picture.
Contradiction: The teens are spray-painting the side of the building with graffiti.
Contradiction: They are not needed to make a civilian police force.
Contradiction: Gates, the chief architect, works with several people who work for Microsoft. 
Contradiction: the woman in black played the flute
Contradiction: Captain George Vancouver once worked for Captain Cook.