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1```console
2$ 04_01_enum --help
3A simple to use, efficient, and full-featured Command Line Argument Parser
4
5Usage: 04_01_enum[EXE] <MODE>
6
7Arguments:
8  <MODE>
9          What mode to run the program in
10
11          Possible values:
12          - fast: Run swiftly
13          - slow: Crawl slowly but steadily
14
15Options:
16  -h, --help
17          Print help (see a summary with '-h')
18
19  -V, --version
20          Print version
21
22$ 04_01_enum -h
23A simple to use, efficient, and full-featured Command Line Argument Parser
24
25Usage: 04_01_enum[EXE] <MODE>
26
27Arguments:
28  <MODE>  What mode to run the program in [possible values: fast, slow]
29
30Options:
31  -h, --help     Print help (see more with '--help')
32  -V, --version  Print version
33
34$ 04_01_enum fast
35Hare
36
37$ 04_01_enum slow
38Tortoise
39
40$ 04_01_enum medium
41? failed
42error: invalid value 'medium' for '<MODE>'
43  [possible values: fast, slow]
44
45For more information, try '--help'.
46
47```
48