Here, {HEAD ~ the honeycomb units} of the ceramic block may have {TAIL ~ three kinds} of shapes 
Here , { HEAD ~ the honeycomb units } of the ceramic block may have { TAIL ~ three kinds } of shapes
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH