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