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Using Data.Map or even Data.Map.Strict is not enough for Haskell. You need to either use Data.IntMap.Strict or Data.HashMap.Strict, enable the {-# LANGUAGE Strict #-} extension, and use ByteString instead of String.
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Fighting Armies
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Using
Data.Mapor evenData.Map.Strictis not enough for Haskell. You need to either useData.IntMap.StrictorData.HashMap.Strict, enable the{-# LANGUAGE Strict #-}extension, and useByteStringinstead ofString.