map -package:containers -package:case-insensitive -package:insert-ordered-containers -package:monoidal-containers -package:base-compat-batteries -package:foldl -package:base-prelude -package:dlist -package:ghc -package:base-compat -package:invertible package:basement is:exact
Map all element a from a block to a new block of b
Map all elements in a list