Anchor: The delivery function is the most important source of inherent cost differences between the geographic areas served by a post and, indeed between posts themselves.
Entailed: The delivery function is the most important source of cost differences.
Contradiction: The delivery function doesn't vary at all.
Contradiction: The boys are by the tree while the girls are by the building.
Contradiction: Women competing on rollerskates
Contradiction: The boy is writing an essay in class.
Contradiction: Tourists, as well as film and TV people, are helping to squeeze out the writers and painters who used to frequent the cafes of St-Germain-des-Pres.