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import java.util.Comparator;
interface BaseStream<T> {}
interface Stream<T> extends BaseStream<T> {}
interface IntermediateOp<E_IN, E_OUT> extends StreamOp<E_IN, Node<E_OUT>> {}
interface StreamOp<E_IN, R> {}
interface StatefulOp<E_IN, E_OUT> extends IntermediateOp<E_IN, E_OUT> {}
interface TerminalOp<E_IN, R> extends StreamOp<E_IN, R> {}
interface Node<T> extends Iterable<T> {}
class SortedOp<T> implements StatefulOp<T, T> {
public SortedOp(Comparator<? super T> comparator) {
}
}
class Usage<T> {
public <E, S extends BaseStream<E>> S pipeline(IntermediateOp<T, E> newOp) { return null; }
public <R> R pipeline(TerminalOp<T, R> terminal) { return null;}
public Stream<T> sorted(Comparator<? super T> comparator) {
return pipeline(new SortedOp<>(comparator));
}
}
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