(a) Sulfur, Charcoal and Nitrogen Oxide
(b) Sulfur, Charcoal, and Potassium Nitrate
(c) Sulfur and Charcoal
(d) Charcoal and Potassium Nitrate
(a) Sulfur, Charcoal and Nitrogen Oxide
(b) Sulfur, Charcoal, and Potassium Nitrate
(c) Sulfur and Charcoal
(d) Charcoal and Potassium Nitrate
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