{HEAD ~ The rail section} has {TAIL ~ a profile} that provides one or more roller contact areas extending a length of the rail section 
has
{ HEAD ~ The rail section } has { TAIL ~ a profile } that provides one or more roller contact areas extending a length of the rail section
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH