map -package:containers -package:Cabal-syntax -package:base-prelude -package:bytestring -package:blaze-html -package:pipes -package:invertible -package:case-insensitive -package:dense-linear-algebra -package:insert-ordered-containers -package:conduit -package:psqueues package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list