{HEAD ~ These polyfunctional cross linking agents} are generally known as {TAIL ~ polyamidepolyamine epichlorohydrin adducts} 
{ HEAD ~ These polyfunctional cross linking agents } are generally known as { TAIL ~ polyamidepolyamine epichlorohydrin adducts }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL