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Updated Concepts (markdown)

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Concepts.md

@ -231,10 +231,18 @@ Key <kbd>^L</kbd> clears and <kbd>Esc</kbd> exits all prompts.
The handy REPL command prompt <kbd>]</kbd> understands environment variables (like `$PWD`). Refer to your shell's documentation (e.g. `BASH_ENV` for bash, `~/.zshenv` for zsh) to use aliases and functions. To fuzzy-select commands from your shell history at the command prompt and issue them after editing (like [fc](http://manpages.ubuntu.com/manpages/bionic/man1/fc.1posix.html)), copy the plugin `fzhist` (as `h` maybe?) in your `$PATH`.
The special variable `$nnn` denotes the hovered file name. It is accessible from the command prompt or a spawned shell.
All binary questions are confirmed by <kbd>y</kbd> or <kbd>Y</kbd>.
#### Special variables
The following special variables can be accessed from the command prompt or a spawned shell:
| Variable | Description |
|:---:| --- |
| `$nnn` | Hovered file name in current context |
| `$dn` | Path open in context n [n=1/2/3/4] |
| `$fn` | File path hovered in context n [n=1/2/3/4] |
## Design
`nnn` (the core C utility) is, generally speaking, _feature-restricted_. It includes features which you _really_ need so it can remain light enough to finish your workflow accurately before your train of thought is lost.