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