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dichlorodiethyl, dichlorodifluoromethane, dichloro-diiodomethane, dichlorodinitromethane, dichlorodiphenyl trichloroethane, dichloro-diphenyl-dichloro-ethane, dichlorodiphenyl-trichloroethane, dichloroethane, dichloroethanol, dichloroether,

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First Lady, first law of thermodynamics, first lieutenant, first light, first mate, first mortgage, first name, first of all, first offender, first period,