Anchor: Costs for each postal activity (mail processing, delivery, etc) that can be attributed to mail volumes, are divided by total volume to obtain an estimate of the marginal cost.
Entailed: The costs are calculated by mail volumes, that are then divided by each activity. 
Contradiction: They had no idea how much the postal activities costs til they got their invoice each month.
Contradiction: The people are running.
Contradiction: Dogs play outdoors.
Contradiction: The dark headed woman stands alone in a city.
Contradiction: A man is lifting something