code: public final void sendMessageToAllNeighbors(Message m) {
  		verifyEdgeUsage();
  		outMsg.f1 = m;
  		while (edges.hasNext()) {
  			Tuple next = edges.next();
  			outMsg.f0 = next.getField(1);
  			out.collect(Either.Right(outMsg));
  		}
  	}
docs: Sends the given message to all vertices that adjacent to the changed vertex.
  This method is mutually exclusive to the method {@link #getEdges()} and may be called only once.
  
  @param m The message to send.