Anchor: This is the case whether or not any mailers decide on the basis of the price differentials to engage in drop shipping.
Entailed: Even if mailers decide the base of differing prices, they engage in drop shipping. 
Contradiction: Mailers never engage in drop shipping. 
Contradiction: A teenager is riding his skateboard
Contradiction: A man is outside.
Contradiction: The Ruby citizens love the diversity of their town. 
Contradiction: An under dressed woman is waiting on the sidewalk.