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