<prompt> Translate the following text to EnglishMfumo wa nne unafafanua masharti ambayo Huduma inaweza kutumia vipindi vya majaribio ya miaka mingi ili kuonyesha kwamba huduma mpya iliyopendekezwa itakuwa ya kulipia kwa muda.  <response>: The fourth set specifies conditions under which the Service may use multi-year test periods to demonstrate that a proposed new service will become compensatory over time. 