<prompt> Ramba uchiverenga ndima iyi - Upper Mustang iri munzira yekare yezvokutengeserana pakati peNepal neTibet ichishandisa nzira yakaderera yeKora La kuburikidza neHimalaya kumadokero kweSikkim. Nzira iyi yakaramba ichishandiswa kusvikira kuChina kwabatanidza Tibet  <response>: muna 1950. 