map -package:containers -package:blaze-html -package:charset -package:invertible -package:Cabal-syntax -package:monoidal-containers -package:amazonka-core -package:hedgehog -package:base -package:conduit -package:incipit-base -package:dlist is:exact package:basement
Map all element a from a block to a new block of b
Map all elements in a list