It seems likely that U.S. and foreign mailers would prepare AO mail so that it would qualify for lower domestic rates applicable to printed matter and/or lower priority delivery.
The U.S. and foreign mailers would likely prepare AO mail.
mnli hypothesis: The U.S. and foreign mailers would likely prepare AO mail. premise: It seems likely that U.S. and foreign mailers would prepare AO mail so that it would qualify for lower domestic rates applicable to printed matter and/or lower priority delivery.