Finally, {TAIL ~ circuits} are described which show embodiments of the invention according to {HEAD ~ the two methods} 
Finally , { TAIL ~ circuits } are described which show embodiments of the invention according to { HEAD ~ the two methods }
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD