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3d, acid, antioxidant, ascorbic, atom, atomic, atoms, background, biochemistry, biology, bond, c, chemical, chemistry, citrus, compound, diet, education, element, food, formula, fruit, health, healthy, hydrogen, isolated, lemon, medical, medicine, metabolism, model, molecular, molecule, nutrient, nutrition, orange, organic, research, science, scientific, sphere, structure, substance, supplement, symbol, technology, treatment, vitamin, white,