| as_categorical | Create a categorical variable | 
| as_classification | Convert a data.frame to a classification object | 
| as_classification_simple | Create classification with only one level | 
| cast_level | Convert classification ID to factor a specified level of... | 
| complete_classification | Complete classification in case branches in tree are not all... | 
| nace_rev2 | NACE Rev.2 Classification | 
| read_classification | Read classification from file. | 
| save_classification | Save classification to file | 
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