map is:exact -package:text -package:aeson -package:case-insensitive -package:conduit -package:Cabal-syntax -package:dense-linear-algebra -package:bytestring -package:base-compat -package:dlist -package:ghc -package:hedgehog -package:base-prelude package:basement
Map all element a from a block to a new block of b
Map all elements in a list