{HEAD ~ Opto isolator} that uses {TAIL ~ a nontransparent hollow tube} as the optical waveguide extending between the transmitter and receiver modules of the opto isolator 
uses
{ HEAD ~ Opto isolator } that uses { TAIL ~ a nontransparent hollow tube } as the optical waveguide extending between the transmitter and receiver modules of the opto isolator
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH