{HEAD ~ Reagents} used in preparing a graft polymer are selected from {TAIL ~ the group} consisting of carbon dioxide, silicon halides, and anionically polymerizable monomers 
{ HEAD ~ Reagents } used in preparing a graft polymer are selected from { TAIL ~ the group } consisting of carbon dioxide , silicon halides , and anionically polymerizable monomers
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH