Chromium Code Reviews| Index: CHANGELOG.md | 
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| +## 1.6.0 | 
| + | 
| +* Add a `GroupSet` class that provides a view of the union of a set of sets. | 
| + | 
| +* Add a `SetGroup` class that provides a convenient way to manage the contents | 
| + of a `GroupSet`. | 
| + | 
| ## 1.5.1 | 
| * Fix an incorrectly-declared generic type. |