Thereafter, the bids forming this combination can be declared the winning bids of the auction, {TAIL ~ reverse auction} or {HEAD ~ exchange} 
Thereafter , the bids forming this combination can be declared the winning bids of the auction , { TAIL ~ reverse auction } or { HEAD ~ exchange }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD