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Helpful documents:<br />
- [Roman Zolotarev: Edit text with vi(1)](https://rgz.ee/vi.html)<br />
+- [Hugo Daniel: vi is not vim](https://hugodaniel.pt/posts/vi-is-not-vim/)<br />
- [Jeff W: vi help](http://www.jeffw.com/vi/vi_help.txt)<br />
- [Maarten Litmaath: vi reference](http://www.ungerhu.com/jxh/vi.html)<br />
- [alphanrrrd: extremely concise cheatsheet](http://www.alphanrrrd.org/vi.html)<br />