Anchor: The first is for presorting, the second for putting on barcodes and assuring machinability, the third for drop shipping, and the fourth for being letter-sized instead of flat-sized.
Entailed: Including barcodes can sometimes be associated with assuring machinability.
Contradiction: Flat sized and letter sized packages are the same thing.
Contradiction: The potential exists to drive in excess of $900 million per year 
Contradiction: What could they be?
Contradiction: he told me that bicycling was a bad idea and i shouldn't do it
Contradiction: He left the room.