AND gates of the power levels for controlling said realized level combinations by controlling positions of signal contacts of the three phase contactors by {HEAD ~ means} of {TAIL ~ said contactor position lines} 
of
AND gates of the power levels for controlling said realized level combinations by controlling positions of signal contacts of the three phase contactors by { HEAD ~ means } of { TAIL ~ said contactor position lines }
OTH OTH OTH OTH 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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL