ListSegment`1 Delimits a section of a list.

 ReadOnlyCollectionView`2 Represents lazily converted read-only collection.

 ReadOnlyDictionaryView`3 Represents lazily converted read-only dictionary.

 ReadOnlyListView`2 Represents lazily converted read-only list.

 AsyncEnumerable Provides extension methods for interface.

 Collection Provides utility methods to work with collections.

 Dictionary Represents various extensions for types and .

 Enumerator Various methods to work with classes implementing interface.

 List Provides various extensions for interface.

 Set Represents various extension methods for sets.

 IEnumerator`2 Represents ad-hoc enumerator implemented as value type to avoid enumerator allocation and prevent the compiler to generate call.