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2. Cl2. S. S. Cl2
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3. C. Zn. Zn. C
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4. 4H. Mn. Mn. 4H
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5. H2 S. S. H2
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6. H2. F2. F2. H2
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7. 4 NH3. 5O2. 5O2. 4 NH3