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