map is:exact -package:text -package:base-compat-batteries -package:base -package:Cabal-syntax -package:containers -package:foldl -package:incipit-base -package:bytestring -package:insert-ordered-containers -package:filepath -package:ghc -package:base-prelude package:basement
Map all element a from a block to a new block of b
Map all elements in a list