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