Anchor: The snowboarder has used a ramp-shaped snow pile to hurl himself or herself into the air.
Entailed: A person is snowboarding.
Contradiction: A person is sleeping.
Contradiction: There are four men in the picture.
Contradiction: People and flags are all milling together.
Contradiction: Most people these days don't care to question long held beliefs because they age scared and don't want to rock the boat. 
Contradiction: The city is still famous for its formidable fortifications.