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The classification system of the sixth revision of the Occupational Standard Classification is divided into four levels: major, medium, small, and detailed categories. The coding method uses 1, 2, 3, and 4-digit codes for major, medium, small, and detailed categories respectively. If the last digit of the medium, small, or detailed category is "0", it indicates that the level is not further subdivided. If the last digit is "9", it represents other categories.