{HEAD ~ The second optical window} may be formed in {TAIL ~ a straight line} with an optical input/output section formed in the memory die and the first optical window 
{ HEAD ~ The second optical window } may be formed in { TAIL ~ a straight line } with an optical input / output section formed in the memory die and the first optical window
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH