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Update concrete-mutable-collection-classes.md #1382

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3 changes: 2 additions & 1 deletion _overviews/collections-2.13/concrete-mutable-collection-classes.md
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Expand Up @@ -81,7 +81,8 @@ Scala provides mutable queues in addition to immutable ones. You use a `mQueue`

## Stacks

You saw immutable stacks earlier. There is also a mutable version, supported by class [mutable.Stack](http://www.scala-lang.org/api/{{ site.scala-version }}/scala/collection/mutable/Stack.html). It works exactly the same as the immutable version except that modifications happen in place.
A stack implements a data structure which allows to store and retrieve objects in a last-in-first-out (LIFO) fashion.
It is supported by class [mutable.Stack](http://www.scala-lang.org/api/{{ site.scala-version }}/scala/collection/mutable/Stack.html).

scala> val stack = new scala.collection.mutable.Stack[Int]
stack: scala.collection.mutable.Stack[Int] = Stack()
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