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