map -package:containers -package:basement -package:psqueues -package:Cabal-syntax -package:base-compat-batteries -package:foldl -package:conduit -package:charset package:hedgehog is:exact
Generates a map using a
Range to determine the length.
This may fail to generate anything if the keys produced by the
generator do not account for a large enough number of unique
items to satify the required map size.