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(a) All cities, which at the last federal census had, or now have, a population exceeding two thousand five hundred (2,500) inhabitants shall be deemed cities of the first class.
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(b) All cities which, at any future federal census, or any census which may be taken in pursuance of the laws of this state, shall be found to have a population of two thousand five hundred (2,500) inhabitants shall thereafter be deemed cities of the first class.
