map -package:containers -package:base-compat -package:blaze-html -package:dlist -package:dense-linear-algebra -package:ghc -package:monoidal-containers -package:amazonka-core -package:base-compat-batteries -package:hedgehog -package:os-string package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list