Also, one or more cross linking agents may be used in conjunction with one or more gelling agents in {HEAD ~ order} to cross link {TAIL ~ the gelling agent} 
Also , one or more cross linking agents may be used in conjunction with one or more gelling agents in { HEAD ~ order } to cross link { TAIL ~ the gelling agent }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL