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📝 Side.
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@ -21,6 +21,7 @@ pattern Prj :: Element sub sup => sub a -> sup a
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pattern Prj sub <- (prj -> Just sub)
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pattern Prj sub <- (prj -> Just sub)
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-- | Where does the element occur in the tree?
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data Side = None | Here | L | R
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data Side = None | Here | L | R
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type family Find sub sup :: Side where
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type family Find sub sup :: Side where
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