{TAIL ~ The second control signal} is coupled to an input of {HEAD ~ the NAND gate} and inactivates the first control signal 
{ TAIL ~ The second control signal } is coupled to an input of { HEAD ~ the NAND gate } and inactivates the first control signal
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH