`3Mn_3 O_4 + 8Al to 4Al_2 O_3 + 9Mn``Cr_2 O_3 + 2AL to Al_2 O_3 + 2Cr``2Cu_2 O + Cu_2 S to 6Cu + SO_2``2HgO + HGS to 3Hg + SO_2`
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