Postal Service and FPAs were to pay each other terminal dues applying full First Class mail rates to all LC and AO mail exchanged, the U.S.
They both did not have to pay for the First Class mailings.
mnli hypothesis: They both did not have to pay for the First Class mailings. premise: Postal Service and FPAs were to pay each other terminal dues applying full First Class mail rates to all LC and AO mail exchanged, the U.S.