The front end environment incorporates circuit operation optimization methods to identify {TAIL ~ optimal locations} for {HEAD ~ a circuit operation} 
The front end environment incorporates circuit operation optimization methods to identify { TAIL ~ optimal locations } for { HEAD ~ a circuit operation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD