The program memory 420 commonly applies {HEAD ~ the selection control signal} to {TAIL ~ the second group multiplexers} 431 434 
to
The program memory 420 commonly applies { HEAD ~ the selection control signal } to { TAIL ~ the second group multiplexers } 431 434
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH