{TAIL ~ A composite number} is a token number combined with either an index number or {HEAD ~ length number} 
{ TAIL ~ A composite number } is a token number combined with either an index number or { HEAD ~ length number }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD