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