It is not intended to identify {HEAD ~ key or critical elements} of the invention or to delineate {TAIL ~ the scope} of the invention 
It is not intended to identify { HEAD ~ key or critical elements } of the invention or to delineate { TAIL ~ the scope } of the invention
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH