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Table 7 Example showing the eight combinations when we have two hierarchical quasi-identifiers where we disclose all of their levels

From: De-identifying a public use microdata file from the Canadian national discharge abstract database

Combination ID    PROV_XXX    AGE_GROUP    GENDER_CODE    MRDx    CMG_CODE    DIAG_BLOCK    DIAG_CHAPTER    CCI_CODE    SHORT_CCI
2a    X    X    X    X        X  
2b    X    X    X      X       X  
2c    X    X    X       X      X  
2d    X    X    X        X    X  
2e    X    X    X    X         X
2f    X    X    X      X        X
2g    X    X    X       X       X
2h    X    X    X        X      X