{HEAD ~ The method} may include mounting {TAIL ~ a memory package} including a second optical window formed at a surface and a built in memory die on a PCB including a first optical window formed at a surface and a built in optical waveguide 
include mounting
{ HEAD ~ The method } may include mounting { TAIL ~ a memory package } including a second optical window formed at a surface and a built in memory die on a PCB including a first optical window formed at a surface and a built in optical waveguide
HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH