map -package:containers -package:base-compat -package:bytestring -package:dense-linear-algebra -package:Cabal-syntax -package:foldl -package:aeson -is:exact -package:base-compat-batteries is:exact -package:base-prelude -package:incipit-base package:basement
Map all element a from a block to a new block of b
Map all elements in a list