{TAIL ~ These extended end sections} constitute {HEAD ~ a leading end section} 12 and a trailing end section 14 
{ TAIL ~ These extended end sections } constitute { HEAD ~ a leading end section } 12 and a trailing end section 14
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH