oxidizing {TAIL ~ the carboxyl acid groups} of the resulting graft polymer into {HEAD ~ percarboxyl acid groups}; and 
oxidizing { TAIL ~ the carboxyl acid groups } of the resulting graft polymer into { HEAD ~ percarboxyl acid groups } ; and
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH