{HEAD ~ a selector element} having a first input, a second input, an output, and {TAIL ~ a control signal}, wherein: 
{ HEAD ~ a selector element } having a first input , a second input , an output , and { TAIL ~ a control signal } , wherein :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH