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