{HEAD ~ The catalyst carrier} formed of {TAIL ~ this honeycomb unit} 130 has a high conversion rate 
{ HEAD ~ The catalyst carrier } formed of { TAIL ~ this honeycomb unit } 130 has a high conversion rate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH