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The INDEX command may now specify BADKEYS or LISTBADKEYS to effect the same processing as DUPKEYS and LISTDUPKEYS performs. If both LISTBADKEYS and LISTDUPKEYS are specified, then all bad keys are listed ahead of dupkeys. They can be distinguished by whether or not they are duplicate. Badkeys are keys that specify string Y2K (baseyear) key values where the master record has non-numeric data in the field.