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I've got a .csv file with ZIP codes containing the city and its sub-districts
67401,City 1,district_a
67401,City 2,district_b
67401,City 3,district_c
67401,City 3,district_d
67401,City 3,district_e
67401,City 3,district_f
67401,City 3,district_g
67401,City 3,district_h
67401,City 3,district_i
6...