Among the eight regions, {HEAD ~ four regions} are provided in the outer peripheral portion and four regions are provided in {TAIL ~ the inner peripheral portion} 
Among the eight regions , { HEAD ~ four regions } are provided in the outer peripheral portion and four regions are provided in { TAIL ~ the inner peripheral portion }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL