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