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