map -package:containers -package:insert-ordered-containers -package:foldl -package:base-compat -package:ghc -package:base-compat-batteries -package:base -package:amazonka-core -package:incipit-base -package:invertible -package:case-insensitive package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list