Anchor: The bank teller is waiting for a customer.
Entailed: At a bank, a customer is being waited on by a teller.
Contradiction: The bank teller is drawing a gun from her purse.
Contradiction: After four months of working, I have not received a promotion. 
Contradiction: A boy has water that hasn't evaporated on the surface of his skin.
Contradiction: It isn't a problem, this whole situation is not complex.
Contradiction: a man bikes outside with a baby