{HEAD ~ power} off preserving {TAIL ~ means} for powering off the system after transferring the data held in the first storing means to the hard disk 
off preserving
{ HEAD ~ power } off preserving { TAIL ~ means } for powering off the system after transferring the data held in the first storing means to the hard disk
HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH