Oh, this interesting little thing I noticed just now: jodrellblank also mentioned "enclose bind grade_up index self_right" hours before me in https://news.ycomb

Oh, this interesting little thing I noticed just now: jodrellblank also mentioned "enclose bind grade_up index self_right" hours before me in https://news.ycombinator.com/item?id=28095934 https://news.ycombinator.com/item?id=28095934 And I had read that comment! It just didn't register at all when I read that comment; even though I read it word by word, I did not realize that he also wrote the sort train (until I read it again now and converted to symbols in my head). Yet I would have immediately recognized it had I seen it written as APL symbols. Visual pattern matching can be strong. (It's what allows you to recognize and read words that you do not know how to spell correctly.)