Anchor: Skateboard rider riding a skateboard down a wooden ramp.
Entailed: There is a skateboard rider riding down a ramp.
Contradiction: There is a bike rider riding down a ramp.
Contradiction: Workmen are a tractor are in a open-field.
Contradiction: engineers often make mistakes because they use textbook formulas to solve problems
Contradiction: Children are playing tag in a grassy field.
Contradiction: There are men outside.