<prompt> Translate the following text to SwahiliFrom a procedural perspective, the legal soundness of rate or mail classification changes by contract alone is doubtful because the only means of making such changes recognized in the Reorganization Act are the procedures prescribed in Chapter 36 of Title 39.  <response>: Kutokana na mtazamo wa utaratibu, uhalali wa kisheria wa mabadiliko ya kiwango au uainishaji wa barua kwa mkataba pekee ni shaka, kwa sababu njia pekee ya kufanya mabadiliko kama hayo yatambuliwa katika Sheria ya Utaratibu ni taratibu zilizopendekezwa katika Sura ya 36 ya Kichwa cha 39. 