\sqrt[D]{D} \frac{D}{D} \frac{\frac{D}{D}}{\frac{D}{D}} \frac{\sqrt[D]{D}}{D} \overset{\overset{D}{D}}{D} \underset{\underset{D}{D}}{D} D_{D_{D}^{D}}^{D_{D}^{D}}

$\sqrt[A]{A} \frac{A}{A} \frac{\frac{A}{A}}{\frac{A}{A}} \frac{\sqrt[A]{A}}{A} \overset{\overset{A}{A}}{A} \underset{\underset{A}{A}}{A} A_{A_{A}^{A}}^{A_{A}^{A}}$

$\sqrt[C]{D} \frac{C}{C} \frac{\frac{C}{C}}{\frac{C}{C}} \frac{\sqrt[C]{C}}{C} \overset{\overset{C}{C}}{D} \underset{\underset{C}{C}}{D} D_{C_{C}^{C}}^{C_{C}^{C}}$