more dupe word typos
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@@ -13,8 +13,7 @@
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//!
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//! There are three groups of traits involved in each traversal.
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//! - `TypeFoldable`. This is implemented once for many types, including:
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//! - Types of interest, for which the the methods delegate to the
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//! folder.
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//! - Types of interest, for which the methods delegate to the folder.
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//! - All other types, including generic containers like `Vec` and `Option`.
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//! It defines a "skeleton" of how they should be folded.
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//! - `TypeSuperFoldable`. This is implemented only for each type of interest,
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