map is:exact -package:text -package:containers -package:case-insensitive -package:base-compat -package:conduit -package:aeson -package:foldl -package:invertible -package:amazonka-core -package:monoidal-containers -package:dlist -package:base-prelude package:basement
Map all element a from a block to a new block of b
Map all elements in a list