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interface Topology {
  //...
  Iterable<PipelinedRegion> getAllPipelinedRegions();

  PipelinedRegion getPipelinedRegionOfVertex(VID vertexId);
  //...
}

interface PipelinedRegion {
  Iterable<V> getVertices();

  Iterable<V>V getVertex(VID vertexId);

  Iterable<R> getConsumedResults();
}