sum fold of product fold all drop 3 up 13 of all of iota 100

and all that jazz

Had a fantastic discussion with a Dyalog (APL!) chap last night at Functional Kubs Dublin; mind-boggling fun programming.

I will find a way to toot habitually on this instatiation but my god is it a task and a half :o (Mark II) is a lipogrammatic Mastodon for all.
Ambigram by B. Morin, CC BY-SA 4.0