map -package:containers -package:aeson -package:amazonka-core -package:dense-linear-algebra -package:foldl -package:base-compat-batteries -package:blaze-html -package:integration -package:Cabal-syntax -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