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# secondaryGroupingSize

Specifies how often the secondary grouping separator appears, a `CFNumber` object.

```
static let secondaryGroupingSize: CFNumberFormatterKey!
```

## Discussion

See [Creating and Using CFNumberFormatter Objects](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFDataFormatting/Articles/dfCreatingCFNumberFormatters.html#//apple_ref/doc/uid/TP40002342) for more information.

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