In the case of a P channel device in {TAIL ~ the output driver}, the blocking polarity potential is {HEAD ~ a positive potential} applied to the gate 
In the case of a P channel device in { TAIL ~ the output driver } , the blocking polarity potential is { HEAD ~ a positive potential } applied to the gate
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH