map -package:containers -package:Cabal-syntax -package:base-compat -package:base-prelude -package:invertible -package:foldl -package:amazonka-core -package:blaze-html -package:monoidal-containers is:exact -package:os-string -package:case-insensitive package:basement
Map all element a from a block to a new block of b
Map all elements in a list