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