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