Anchor: Therefore we use postal density as the driver of fixed costs.
Entailed: Fixed costs are pegged to postal density.
Contradiction: Fixed costs are determined by vote.
Contradiction: A woman runs down the street chased by a moped.
Contradiction: The fireman is preparing to extinguish a car fire.
Contradiction: Four people sit on a bus wearing ski masks.
Contradiction: A woman performs on an instrument.