In an exemplary embodiment the list of firms contains {HEAD ~ actual firm names}; however, in {TAIL ~ other embodiments} this list could include anonymous representations of the firms—for example, numbers combined with firm characteristics 
In an exemplary embodiment the list of firms contains { HEAD ~ actual firm names } ; however , in { TAIL ~ other embodiments } this list could include anonymous representations of the firms — for example , numbers combined with firm characteristics
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH