Anchor: Just 20 years ago, young blacks and young whites smoked in equal percentages.
Entailed: There were equal amounts of young blacks and young whites that smoked as recently as 20 years ago.
Contradiction: Young whites smoked at a higher rate than young blacks 20 years ago.
Contradiction: A woman is in front of her laptop.
Contradiction: There is a requirement that will not burden businesses that much.
Contradiction: Warm never returned to his job. 
Contradiction: The dog is pulling the man.