map -package:containers -package:ghc -package:dlist -package:insert-ordered-containers -package:invertible -package:amazonka-core -package:monoidal-containers -package:bytestring -package:psqueues -package:incipit-base -package:regex-tdfa -package:conduit package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list