{HEAD ~ The printed circuit board} may include an embedded optical waveguide and {TAIL ~ a first optical window} extending from the optical waveguide to a first surface of the printed circuit board 
include
{ HEAD ~ The printed circuit board } may include an embedded optical waveguide and { TAIL ~ a first optical window } extending from the optical waveguide to a first surface of the printed circuit board
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH