{HEAD ~ The zirconia particles} are substantially non associated and have {TAIL ~ an average size} no greater than 50 nanometers and may contain yttrium 
have
{ HEAD ~ The zirconia particles } are substantially non associated and have { TAIL ~ an average size } no greater than 50 nanometers and may contain yttrium
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH