{HEAD ~ first and second end caps} formed with {TAIL ~ tangs} providing an interference fit with the walls of said central groove of said channel to secure said first and second end caps to said first and said second ends of said channel, respectively 
formed with
{ HEAD ~ first and second end caps } formed with { TAIL ~ tangs } providing an interference fit with the walls of said central groove of said channel to secure said first and second end caps to said first and said second ends of said channel , respectively
HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH