{HEAD ~ The first interface} is arranged to connect {TAIL ~ the computers}, and the first interface has a port for connecting a network interface of the computers 
{ HEAD ~ The first interface } is arranged to connect { TAIL ~ the computers } , and the first interface has a port for connecting a network interface of the computers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH