Anchor: These third-party sorters collect mail from mailers, sort and apply barcodes, and deliver the mail to the Postal Service for a portion of the discount.
Entailed: 3rd party sorters collect mail, sort it, apply barcodes then transfer mail to the USPS for a lower cost. 
Contradiction: 3rd party sorters cost the same as postal service sorters. 
Contradiction: The dog is tugging on a fleece sweater.
Contradiction: At least two people are on a train.
Contradiction: I understand.
Contradiction: The Dutch formed an alliance with the Malays in 1633 seeking part of the Portuguese spice trade.