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