Since the pulse g3 is inputted, {TAIL ~ the control circuit} 20 does not produce {HEAD ~ any pulse} 
Since the pulse g3 is inputted , { TAIL ~ the control circuit } 20 does not produce { HEAD ~ any pulse }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD