original: The fourth and fifth digits designate the number of the urban area (in a district-free city) or the district (in a city with districts).
simplifications: the fourth and fifth numbers are the number of the districts in a district city, or number of urban areas in a non-district city. The fourth and fifth digits point to the the number of the urban area. The fourth and fifth digits designate the number of the area or district. The fourth and fifth digits assign the number to an urban area or a district. The fourth and fifth digits are the urban area number or the district number (in a city with districts). The fourth and fifth digits show the number of the urban area in a district-free city. They show the district in a city with districts. The fourth and fifth digits represent the number of the district or the urban area (in a city without districts). The fourth and fifth digits designate the number of the urban area or the district. The fourth and fifth digits specifies the number of the urban area or the district. The fourth and fifth digits provide the number of the urban area in a district-free city. It also provides the number for the district in a city with districts).