map -package:containers -package:charset -package:ghc is:exact -package:insert-ordered-containers -package:base-compat-batteries -package:Cabal-syntax -package:base-prelude -package:dense-linear-algebra -package:dlist -package:bytestring -package:base-compat package:basement
Map all element a from a block to a new block of b
Map all elements in a list