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