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