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