{TAIL ~ a fourth switching element} disposed between a control terminal of the first switching element and {HEAD ~ a control terminal} of the third switching element 
{ TAIL ~ a fourth switching element } disposed between a control terminal of the first switching element and { HEAD ~ a control terminal } of the third switching element
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH