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