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