In a file that is 120,000 lines long (eg. [`index.json` in `disposable-email-domains`](https://github.com/ivolo/disposable-email-domains/blob/master/index.json)), the `i`, `a`, `o`, `h` and `l` command don't work (maybe others) Just putting this here quickly as a placeholder, I may come back and add more details later