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