After the reaction is complete, {TAIL ~ the remaining solids} can be separated from the liquids by any suitable physical separation technique, such as, filtration or {HEAD ~ centrifugation} 
After the reaction is complete , { TAIL ~ the remaining solids } can be separated from the liquids by any suitable physical separation technique , such as , filtration or { HEAD ~ centrifugation }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD