Anchor: These amounts are not large, but competition generally prevents charging higher rates to some customers in order to fund reduced rates for others.
Entailed: These amounts are small, but competition restricts charging higher rates to some clients.
Contradiction: All customers are charged at the same rates.
Contradiction: A dog sleeping on a bed.
Contradiction: The men are busy.
Contradiction: Sir James closed the curtains as the sun rose. 
Contradiction: the man is wearing protective clothing