The exchange system redeems exchange system coupons without {HEAD ~ the use} of {TAIL ~ retailer funds} 
of
The exchange system redeems exchange system coupons without { HEAD ~ the use } of { TAIL ~ retailer funds }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL