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as shall secure a just valuation for taxation of all property, real and personal, Provided, that the legislature may allow such exemptions from taxation from time to time as shall seem necessary and just, and all existing exemptions provided by the laws of the Territory, shall continue until changed by the legislature of the State, Provided further, that duplicate taxation of property for the same purpose during the same year, is hereby prohibited.
Sec. 6. The legislature shall not impose taxes for the purpose of any county, city, town, or other municipal corporation, but may by law invest in the corporate authorities thereof, respectively, the power to
