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