The ceramic block has {HEAD ~ multiple honeycomb units} combined by interposing {TAIL ~ an adhesive layer}, where the honeycomb units include an outer peripheral side honeycomb unit and a center side honeycomb unit combined to form the outer peripheral part and the center part, respectively, of the block 
combined by interposing
The ceramic block has { HEAD ~ multiple honeycomb units } combined by interposing { TAIL ~ an adhesive layer } , where the honeycomb units include an outer peripheral side honeycomb unit and a center side honeycomb unit combined to form the outer peripheral part and the center part , respectively , of the block
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH