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# mutableCopy(with:)

Creates a mutable copy of a caption region.

```
func mutableCopy(with zone: NSZone? = nil) -> Any
```

## Parameters

`zone`

The system ignores this parameter. Objective-C doesn’t no longer supports memory zones.

## Return Value

A copy of the region.

## Discussion

This method throws an exception if the caption region contains an identifier.

---

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