Anchor: This leads us to develop the concept of postal density as a measure that reflects the impact of These characteristics on delivery costs.
Entailed: We got the concept of postal density from that.
Contradiction: The density has no affect on the characteristics of costs.
Contradiction: Woman shops for groceries.
Contradiction: The man is very happy.
Contradiction: A cart pulled by two camels was the center of their small travelling wagon group. 
Contradiction: A girl with arm floaties on is floating in the water.