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