| $$ \begin{aligned}aabbabba& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}a^4b^4\end{aligned} $$ | |
| ① | $$ a a b b a b b a = a^{1 + 1 + 1 + 1} b^{1 + 1 + 1 + 1} = a^4 b^4 $$ |