Thus, {HEAD ~ retailers} obtain {TAIL ~ full price} for products purchased with the exchange system coupons 
obtain
Thus , { HEAD ~ retailers } obtain { TAIL ~ full price } for products purchased with the exchange system coupons
OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH