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