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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'.
+
+```