Negative voltage at {HEAD ~ node} 38 is obtained from a negative voltage appearing at {TAIL ~ node} 25 for application to gates of pull up and pull down transistors 42 and 41, as is explained in more detail elsewhere herein 
Negative voltage at { HEAD ~ node } 38 is obtained from a negative voltage appearing at { TAIL ~ node } 25 for application to gates of pull up and pull down transistors 42 and 41 , as is explained in more detail elsewhere herein
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH