In an exemplary embodiment, {TAIL ~ users} of the system are provided with a list of {HEAD ~ n firms} 
In an exemplary embodiment , { TAIL ~ users } of the system are provided with a list of { HEAD ~ n firms }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD