map is:exact -package:text -package:containers -package:dense-linear-algebra -package:insert-ordered-containers -package:base-prelude -package:incipit-base -package:bytestring -package:foldl -package:base-compat -package:base-compat-batteries -package:case-insensitive -package:invertible package:basement
Map all element a from a block to a new block of b
Map all elements in a list