a plurality of level control lines for sequent realization of said level combinations by actuating {TAIL ~ said coils}, in accordance with sequence of {HEAD ~ actuated power levels} 
a plurality of level control lines for sequent realization of said level combinations by actuating { TAIL ~ said coils } , in accordance with sequence of { HEAD ~ actuated power levels }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD