The method 1, wherein N=3, and wherein at step two of said phases are series coupled to said {HEAD ~ source} of operating voltage, and wherein at step , one of said phases is coupled to said source of {TAIL ~ operating voltage} 
The method 1 , wherein N=3 , and wherein at step two of said phases are series coupled to said { HEAD ~ source } of operating voltage , and wherein at step , one of said phases is coupled to said source of { TAIL ~ operating voltage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL