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antioxidant, background, bar, bentonite, black, calcium, chemical, chemistry, chloride, coal, coal powder, conductor, copper, data, dry, earth, earthing, electric, electrical, electricity, equipment, grid, ground, grounding, grounding system, high, hydroxide, industry, insulator, lines, pharmaceutical, powder, powdered, power, processing, protection, rod, salt, sodium, sodium chloride, soil, station, substance, system, systems, technology, voltage, welding, wire, wires,