{HEAD ~ a plurality} of {TAIL ~ relays} adapted for controlling power levels by means of controlling level combinations of said contactors, said relays operated by means of logic gates operating upon desired and actual power levels 
of
{ HEAD ~ a plurality } of { TAIL ~ relays } adapted for controlling power levels by means of controlling level combinations of said contactors , said relays operated by means of logic gates operating upon desired and actual power levels
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH