chapter11 cluster_Nodes Never18 Never True False Con_4 #0 Never18->Con_4 1 Loop8 Loop Never18->Loop8 0 Start2 Start $ctrl Stop3 Stop Return21 Return Stop3->Return21 0 Return21->Never18:p0 0 Return21->Con_4 2 Loop8->Never18:p1 2 Loop8->Start2:p0 1