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4
3
2
1
4th gen CuSO4
3rd gen CuO
2nd gen heating
1st gen Fe2O3
1st gen Al
2nd gen CuNO3 2
1st gen Cu
1st gen N2O4
3rd gen H2SO4
2nd gen SO3
1st gen 2O2
1st gen H2S
2nd gen H2O
1st gen KOH
1st gen HF
