{HEAD ~ a gate electrode} of said {TAIL ~ fourth N channel MOS transistor receives} said input signal; and 
of
{ HEAD ~ a gate electrode } of said { TAIL ~ fourth N channel MOS transistor receives } said input signal ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH