{HEAD ~ This blend} of urethane diol and polyamide polyol is useful in {TAIL ~ various polymer formulations} 
is useful in
{ HEAD ~ This blend } of urethane diol and polyamide polyol is useful in { TAIL ~ various polymer formulations }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL