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This is one of the advantages of Lisp. It is common for Lisp programmers to map the [] keys to () and vice-versa. Since Lisp requires so few of the keys, such mappings can prevent you from needing to press the less comfortable keys.

It is not hard to remap your key bindings if you find `_` too hard to type.

Lisp? ;-)

Forth?

I really like Forth, it seems to me to be very much the right way to do things, however I've never managed to write an actually useful program in it.

Mostly I use Tcl as a sort of Lisp/Forth mashup :-)