I have wondered how to undefine existing commands in $\LaTeX$ for so long. Finally, I googled it up. It's easy. Simply
```latex
\makeatletter
\let\command\@undefined
\makeatother
```
and the `\command` has been undefined. This does not cause an error when `\command` was undefined before. After that, you can merrily
```latex
\newcommand{\command}{Hell Yeah.}
```
and be on your way.
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