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K+|K<Mg2+|Mg<Cr3+|Cr<Hg2+|Hg<Ag+|Ag
Ag+|Ag<Hg2+|Hg<Cr3+|Cr<K+|K<Mg2+|Mg
Ag<Hg<Cr<Hg<Ag
K<Mg<Cr<Hg<Ag
K+|K<Ag+|Ag<Mg2+|Mg<Hg2+|Hg<Cr3+|Cr
ANS : 3
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