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+3 -2 +1 -2 +6 -2 +2 -2 +5 -2 +3 -2 +2 -2
Br2O3 H2S SO3 CaO P2O5 Fe2O3 CO
+2 -2 +4 -2 +1 -2 +2 -2 +3 -2 +1 -2 +1 -2 +2 -2
CuO NO2 Na2O MgO P2O3 Au2O Ag2O NiO