a first insulating layer extending from the top surface of the third semiconductor layer to {HEAD ~ the top surface} of the first semiconductor layer covering on the side surfaces of {TAIL ~ the second and third semiconductor layers} 
a first insulating layer extending from the top surface of the third semiconductor layer to { HEAD ~ the top surface } of the first semiconductor layer covering on the side surfaces of { TAIL ~ the second and third semiconductor layers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL