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