map is:exact -package:bytestring -package:dlist -package:blaze-html -package:insert-ordered-containers -package:ghc -package:conduit -package:foldl -package:amazonka-core -package:base-compat -package:base-prelude -package:case-insensitive package:basement
Map all element a from a block to a new block of b
Map all elements in a list