Anchor: Despite a great deal of study, economists have found no single reason that convincingly explains the decline in the personal saving rate.
Entailed: Economists have not found a singular reason for the decreased rates
Contradiction: The decline in personal saving rate can all be attributed to a single factor.
Contradiction: His brown suit was brand-new. 
Contradiction: The dancers are practicing.
Contradiction: Young person talking on phone in the subway
Contradiction: The man is holding something.