Reflection without Remorse Revealing a hidden sequence to speed up monadic reflection Atze van der Ploeg Centrum Wiskunde & Informatica ploeg@cwi.nl Oleg Kiselyov University of Tsukuba oleg@okmij.org Abstract A series of list appends or monadic binds for many monads per- forms algorithmically worse when left-associated. Continuation- passing style (CPS) is well-known to cure this severe dependence