<prompt> Bheka isigaba esingezansi bese uphendula umbuzo olandelayo ngolimi olufanayo nesigaba: Isigaba: Ngo-1946, uhulumeni waseViet Minh kamuva owaba uhulumeni waseNyakatho Vietnam wethula imali yawo, i-dong, ukuze ithathe indawo ye-piastre yase-French Indochinese ngokulinganayo. Ukulungiswa kabusha kwamabili kwalandelwa, ngo-1951 nango-1959; owokuqala kwaba ngesilinganiso esingu-100: 1, owesibili ngesilinganiso esingu-1,000: 1. Umbuzo: Yimiphi iminyaka lapho kwavela khona ukuvuselelwa?  <response>: Ngo-1951 nango-1959 