Not real sure if this is a mnemoic, but a rule of thumb that I find useful when explaining the behaviour of chained maps and other list functions is

Maps make more sense when read right to left.

OT:I remember learning the color codes for resistors in electronics class in high school. The teacher gave us a contrived mnemoic which frankly I could never keep in my head. I was saved however by an electronics book from years before which had the rather saucy menomic

Bad Boys Raped Our Young Girls But Violette Gave Willingly

Which I have never managed to forget. :-)

Yves / DeMerphq
--
Have you registered your Name Space?