{HEAD ~ Conductor} 50 can be composed of {TAIL ~ copper}, silver, or silver plated copper 
composed of
{ HEAD ~ Conductor } 50 can be composed of { TAIL ~ copper } , silver , or silver plated copper
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH