ClearSameFileObsoletedGroups|Clears same file groups which have only one record left.
When generating same file records, record will only be created while at least 2 files are the same. But after file or same file deleted, there may be only 1 same file record left in the group. These obsoleted records will be ignored while running Select-ImageStoreSameFile but you can still remove them automatically by running this cmdlet. And it's recommended for removing useless records like these.
Alias: ClearSameFileObsoletedGroups
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