Anchor: The agency would require the purchasing office to notify the central office (where payment certification took place) within 20 days of the receipt of the invoice only in instances where the actual receipt of goods differed from the order, thus affecting payment.
Entailed: The payment certification happened in the central office.
Contradiction: The payment certification happened in the factory.
Contradiction: The money thing's a walk in the park.
Contradiction: I lived on pizza and pop.
Contradiction: A teacher is drawing on a chalkboard.
Contradiction: People in the street.