{HEAD ~ SBD} are used extensively with {TAIL ~ CFET} to form a CMOS version of the Diode Transistor Logic circuitry 
used extensively with
{ HEAD ~ SBD } are used extensively with { TAIL ~ CFET } to form a CMOS version of the Diode Transistor Logic circuitry
HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH