$\frac{0}{1}$ $\frac{0}{1}$

$\sqrt[1]{0}$

$0_1$ $0^1$ $0_1^2$ $\underset{1}{0}$ $\stackrel{1}{0}$ $\underset{1}{\overset{2}{0}}$ ${}_6{}^7{}_8{}^{9}0_1^2{}_3{}^4$

$\underset{1}{0}$ $\stackrel{1}{0}$ $\underset{1}{\overset{2}{0}}$ $\underset{1}{\overset{2}{0}}$

$\underset{1}{\overset{2}{0}}$