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