{HEAD ~ Use} of three rails makes a total length of the slide rail shorter to provide {TAIL ~ a compact slide rail} 
{ HEAD ~ Use } of three rails makes a total length of the slide rail shorter to provide { TAIL ~ a compact slide rail }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL