map -package:containers -package:Cabal-syntax -is:exact -package:dense-linear-algebra -package:incipit-base -package:invertible -package:case-insensitive -package:base-prelude -package:insert-ordered-containers -package:blaze-html -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