| Return | Method | Summary |
|---|---|---|
| boolean | remove(Object o) | Removes a single instance of the specified element from this collection, if it is present (optional operation). |
| boolean | removeAll(Collection<?> c) | Removes all of this collection's elements that are also contained in the specified collection (optional operation). |
| boolean | retainAll(Collection<?> c) | Retains only the elements in this collection that are contained in the specified collection (optional operation). |
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