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import Control.Monad
import GHC.Compact
import qualified Data.Map as Map
main = do
let m = Map.fromList [(x,show x) | x <- [1..(10000::Int)]]
c <- compactWithSharing m
print =<< compactSize c
c <- foldM (\c _ -> do c <- compactWithSharing (getCompact c); print =<< compactSize c; return c) c [1..10]
print (length (show (getCompact c)))
print =<< compactSize c
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