In a reverse auction, when at least two of the selected bids include different units, or quantities, of the same item, {HEAD ~ all units} of all items are included in {TAIL ~ each candidate allocation} 
are included in
In a reverse auction , when at least two of the selected bids include different units , or quantities , of the same item , { HEAD ~ all units } of all items are included in { TAIL ~ each candidate allocation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL