??? rou ron roi ro ran nor
??? çou çoi çon çan ço cor
??? tou tan toi tol tom to
??? bou ban boi bol bo bon
??? sson ssan ssoi ssol sso ssou
??? tou ton toi tol tan to
??? siou sian tie siol tion tiai
??? lou lol loi lon lan lo
??? trou tro troi trol tran trom