adding {TAIL ~ a catalyst} into the water to polymerize the monomer in {HEAD ~ the micell} 
adding { TAIL ~ a catalyst } into the water to polymerize the monomer in { HEAD ~ the micell }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD