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