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