The user roles in the role database are available for use by {HEAD ~ a plurality} of {TAIL ~ users} of the application 
of
The user roles in the role database are available for use by { HEAD ~ a plurality } of { TAIL ~ users } of the application
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH