oxygen - element, Fe - element, Nitrogen - element, carbon - element, carbon dioxide - compound, iron sulfide - compound, helium - element, potassium chloride - compound, Al - element, copper carbonate - compound, water - compound, magnesium oxide - compound, Cl - element , FeCl2 - compound , CCl4 - compound, Mg - element , C2H2 - compound, H2O - compound, C6H6 - compound, NaHCO3 - compound ,

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