map is:exact -package:vector -package:containers -package:Cabal-syntax -package:base-prelude -package:insert-ordered-containers -package:blaze-html -package:integration -package:base-compat-batteries -package:ghc -package:dense-linear-algebra -package:base-compat -package:amazonka-core package:basement
Map all element a from a block to a new block of b
Map all elements in a list