{HEAD ~ Numerals} 75, 76 and 77 denote {TAIL ~ a discriminator}, a relay and a contact of the relay 76, respectively 
{ HEAD ~ Numerals } 75 , 76 and 77 denote { TAIL ~ a discriminator } , a relay and a contact of the relay 76 , respectively
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH