A NAND type flash memory device has {HEAD ~ a dummy region} forming {TAIL ~ a dummy pattern} 
forming
A NAND type flash memory device has { HEAD ~ a dummy region } forming { TAIL ~ a dummy pattern }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL