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    Don’t know about Level 4, but Levels 1 to 3 are amenable to solution using your emacs scratch buffer. Elisp has 98% of what you need.

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      I love Emacs, but I never invested time into becoming proficient with Elisp. Do you have any favorite functions or patterns that you find really handy? Would love to add a bit into the post about some cool things you can do in Elisp.