{TAIL ~ The flip flop} provides an output that is only dependent on {HEAD ~ the very fast fall times} of the outputs of the basic level shifter 
{ TAIL ~ The flip flop } provides an output that is only dependent on { HEAD ~ the very fast fall times } of the outputs of the basic level shifter
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH