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