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19. The subdivision, group and class levels provide increasingly detailed dissections of the broad categories.
20. Each subdivision is represented by a two digit code and each group by a three digit code. If there is only one group in a subdivision the group code is the two digit subdivision code followed by 0. Otherwise the code is created using the subdivision code and appending a number starting at 1. No subdivision contains more than 9 groups.
21. Each class is represented by a four digit code. The conventions for creating class numbers within a group are the same as numbering groups within a subdivision. No group contains more than 9 classes.
22. A nine (9) appearing in the fourth digit position usually designates a miscellaneous class. These residual classes do not usually constitute homogeneous primary activities, but rather diverse activities which are not sufficiently significant to justify separate classes. For the purposes of this classification they are grouped together and treated as a separate industry to retain the homogeneity of the other industries in the group.
23. Normally an activity is designated as primary to only one class, but in a few cases of what are called overlapping classes certain individual activities are designated as primary to more than one class. For example Sheep-Beef Cattle Farming (Class 0123) is an overlapping class since farming sheep is an activity also primary to Sheep Farming (Class 0124) and farming beef cattle is an activity also primary to Beef Cattle Farming (Class 0125).