1```console 2$ 04_01_possible --help 3A simple to use, efficient, and full-featured Command Line Argument Parser 4 5Usage: 04_01_possible[EXE] <MODE> 6 7Arguments: 8 <MODE> What mode to run the program in [possible values: fast, slow] 9 10Options: 11 -h, --help Print help 12 -V, --version Print version 13 14$ 04_01_possible fast 15Hare 16 17$ 04_01_possible slow 18Tortoise 19 20$ 04_01_possible medium 21? failed 22error: invalid value 'medium' for '<MODE>' 23 [possible values: fast, slow] 24 25For more information, try '--help'. 26 27``` 28