<prompt> Translate the following text to SwahiliThen the Postal Service could make wide-ranging adjustments of the rates in the subclass, including contract rates for some of the subclass users, as long as the average rate for the subclass does not go below the inverse cap.  <response>: Kisha huduma ya posta inaweza kufanya marekebisho makubwa ya viwango katika subclass, ikiwa ni pamoja na viwango vya mkataba kwa baadhi ya watumiaji wa subclass, kwa muda mrefu kama kiwango cha wastani kwa subclass haipiti chini ya kiwango cha juu cha invers. 