{HEAD ~ A biometric unit} of the BCU has a store of biometric information of {TAIL ~ an authorized BCU user} and compares received biometric information with the stored biometric information to determine if the user is an authorized BCU user 
{ HEAD ~ A biometric unit } of the BCU has a store of biometric information of { TAIL ~ an authorized BCU user } and compares received biometric information with the stored biometric information to determine if the user is an authorized BCU user
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH