# `GSGlyph layerGroups:masters:error:`

*Instance Method*

## Declaration

```objc
- (NSArray<NSMutableOrderedSet<NSString *> *> *) layerGroups:(NSArray<GSInstance *> *) instances masters:(NSArray<GSFontMaster *> *) masters error:(NSError **) error;
```

```python
layerGroups_masters_error_(instances: list[GSInstance], masters: list[GSFontMaster]) -> tuple[list[NSMutableOrderedSet<NSString *>], NSError]
```