functor include
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@@ -13,6 +13,7 @@ import Data.Maybe (Maybe(..))
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import Data.Ord (Ord, comparing)
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import Data.Foldable (Foldable, foldr)
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import Data.Function ((.))
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import Data.Functor (fmap)
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import Control.Monad (return)
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import qualified Data.Set as Set
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