Elements that can be added to {HEAD ~ silver} to produce {TAIL ~ useful silver alloys} include zinc, aluminum, copper, manganese, germanium, yttrium, bismuth, scandium, and cobalt 
to produce
Elements that can be added to { HEAD ~ silver } to produce { TAIL ~ useful silver alloys } include zinc , aluminum , copper , manganese , germanium , yttrium , bismuth , scandium , and cobalt
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH