{HEAD ~ The ceramic block} has {TAIL ~ multiple honeycomb units} combined by interposing 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 
{ HEAD ~ The ceramic block } has { TAIL ~ multiple honeycomb units } combined by interposing 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
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