map is:exact -package:text -package:charset -package:Cabal-syntax -package:dense-linear-algebra -package:conduit -package:foldl -package:amazonka-core -package:insert-ordered-containers -package:invertible -package:base-compat -package:base-prelude -package:base package:basement
Map all element a from a block to a new block of b
Map all elements in a list