Anchor: Charging a usage-based fee for content sounds fair--but it is artificial, because your costs are fixed.
Entailed: Though it sounds fair to charge a usage-based fee, it is artificial.
Contradiction: It's completely genuine and fair to charge a usage-based fee. 
Contradiction: At this time, the indigenous people were herbivores.
Contradiction: A person running with a large inflatable ball.
Contradiction: The blond boy is watching the girl.
Contradiction: Mental retardation can result from the neurotoxins as well as other learning disabilities.