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