A number of unique combinations of {HEAD ~ bids} can be formed from the received bids, and the one combination of bids which represents the best value in {TAIL ~ terms} of an auction setting, a reverse auction setting and an exchange setting can be determined 
A number of unique combinations of { HEAD ~ bids } can be formed from the received bids , and the one combination of bids which represents the best value in { TAIL ~ terms } of an auction setting , a reverse auction setting and an exchange setting can be determined
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH