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https://news.ycombinator.com/item?id=11475340

Interesting. It seems kind of exotic choice to me.

I'm not sure if it is still (or ever was) true, but I heard it uses a text file for the database. Arc lisp for the programming language. And vi (not vim) for the text editor.

It's a dialect of Lisp created by Paul Graham (He's also the author of one of the best Lisp books).

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