In {TAIL ~ some cases}, {HEAD ~ multiple computer systems} may be connected, each residing at a node of a network 
In
In { TAIL ~ some cases } , { HEAD ~ multiple computer systems } may be connected , each residing at a node of a network
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH