map -package:containers -package:incipit-base -package:conduit -package:aeson -package:blaze-html -package:charset -is:exact -package:dense-linear-algebra -package:base-compat -package:monoidal-containers -package:Cabal-syntax -package:base package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list