{HEAD ~ The two sub regions} of {TAIL ~ center region} 34, in an embodiment, are connected together external of the sub regions 
of
{ HEAD ~ The two sub regions } of { TAIL ~ center region } 34 , in an embodiment , are connected together external of the sub regions
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH