Referring now more specifically to applicants invention as shown in FIGS 1 4, a heat tongue 18 is provided having {HEAD ~ a first substantially flat run} 20 and {TAIL ~ a second substantially flat run} 22 
Referring now more specifically to applicants invention as shown in FIGS 1 4 , a heat tongue 18 is provided having { HEAD ~ a first substantially flat run } 20 and { TAIL ~ a second substantially flat run } 22
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH