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```console
$ 04_01_possible --help
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: 04_01_possible[EXE] <MODE>
Arguments:
<MODE> What mode to run the program in [possible values: fast, slow]
Options:
-h, --help Print help
-V, --version Print version
$ 04_01_possible fast
Hare
$ 04_01_possible slow
Tortoise
$ 04_01_possible medium
? failed
error: invalid value 'medium' for '<MODE>'
[possible values: fast, slow]
For more information, try '--help'.
```
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