{TAIL ~ Preferred compounds} include Bi oxide, Co oxide, Cu oxide, {HEAD ~ Fe oxide}, Mn oxide, and Pr oxide, and optionally Ag oxide 
{ TAIL ~ Preferred compounds } include Bi oxide , Co oxide , Cu oxide , { HEAD ~ Fe oxide } , Mn oxide , and Pr oxide , and optionally Ag oxide
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH