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tutorials/tour/_posts/2017-02-13-traits.md
@@ -60,7 +60,7 @@ iterator.next() // prints 1
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This `IntIterator` class takes a parameter `to` as an upper bound. It `extends Iterator[Int]` which means that the `next` method must return an Int.
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## Subtyping
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-Subtypes of traits can be used where a trait is required.
+Where a given trait is required, a subtype of the trait can be used instead.
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```tut
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import scala.collection.mutable.ArrayBuffer
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