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