{HEAD ~ The memory system} 9, wherein the first time period is three time slots and {TAIL ~ the second time period} is three time slots 
{ HEAD ~ The memory system } 9 , wherein the first time period is three time slots and { TAIL ~ the second time period } is three time slots
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH