{TAIL ~ The cache method} 3, wherein {HEAD ~ the shift process} is performed separately and sequentially 
{ TAIL ~ The cache method } 3 , wherein { HEAD ~ the shift process } is performed separately and sequentially
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH