| Class | Description | 
|---|---|
| BufferingSubscriber<T> | |
| DelegatingSubscriber<T,U> | |
| DelegatingSubscription | |
| FilteringSubscriber<T> | |
| FlatteningSubscriber<U> | |
| LimitingSubscriber<T> | |
| SequentialSubscriber<T> | 
 A simple implementation of  
Subscriber that requests data one at a time. | 
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