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📝 Find'.
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@ -30,6 +30,7 @@ type family Find sub sup :: Side where
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Find t (l :+: r) = Find' 'L t l <> Find' 'R t r
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Find _ _ = 'None
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-- | Helper to compute the side an element occurs on.
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type family Find' (side :: Side) sub sup :: Side where
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Find' s t t = s
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Find' s t (l :+: r) = Find' s t l <> Find' s t r
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