One aspect of the invention involves a method for defining {TAIL ~ circuit operations} using {HEAD ~ a circuit operation tool} 
One aspect of the invention involves a method for defining { TAIL ~ circuit operations } using { HEAD ~ a circuit operation tool }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD