map is:exact -package:text -package:containers -package:base-prelude -package:dlist -package:aeson -package:foldl -package:amazonka-core -package:monoidal-containers -package:Cabal-syntax -package:ghc -package:bytestring -package:base-compat package:basement
Map all element a from a block to a new block of b
Map all elements in a list