{HEAD ~ A system} 16 wherein {TAIL ~ the network} comprises a plurality of receiving units in communication with a server 
wherein
{ HEAD ~ A system } 16 wherein { TAIL ~ the network } comprises a plurality of receiving units in communication with a server
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH