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