determining whether said unique user ID is the same for {HEAD ~ each} of said {TAIL ~ one or more devices} 
of
determining whether said unique user ID is the same for { HEAD ~ each } of said { TAIL ~ one or more devices }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL