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```console
$ 04_01_enum --help
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: 04_01_enum[EXE] <MODE>
Arguments:
<MODE>
What mode to run the program in
Possible values:
- fast: Run swiftly
- slow: Crawl slowly but steadily
Options:
-h, --help
Print help (see a summary with '-h')
-V, --version
Print version
$ 04_01_enum -h
A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: 04_01_enum[EXE] <MODE>
Arguments:
<MODE> What mode to run the program in [possible values: fast, slow]
Options:
-h, --help Print help (see more with '--help')
-V, --version Print version
$ 04_01_enum fast
Hare
$ 04_01_enum slow
Tortoise
$ 04_01_enum medium
? failed
error: invalid value 'medium' for '<MODE>'
[possible values: fast, slow]
For more information, try '--help'.
```