{HEAD ~ The network} includes {TAIL ~ a long haul portion} with multicast enabled routers and non multicast enabled routers 
includes
{ HEAD ~ The network } includes { TAIL ~ a long haul portion } with multicast enabled routers and non multicast enabled routers
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH