At the POS, the user invokes the application and then inputs {HEAD ~ a biometric trait} to {TAIL ~ the phone} 
to
At the POS , the user invokes the application and then inputs { HEAD ~ a biometric trait } to { TAIL ~ the phone }
OTH 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