23 Competitors understand clearly that 15-ounce pieces of saturation mail can be carried privately for less than Standard-A rates, while 4-ounce pieces cannot.
Four ounce pieces of mail include most letters and post cards.
mnli hypothesis: Four ounce pieces of mail include most letters and post cards. premise: 23 Competitors understand clearly that 15-ounce pieces of saturation mail can be carried privately for less than Standard-A rates, while 4-ounce pieces cannot.