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