Start Level 1 Node: Periodic Replacement of KeysPeriodic Replacement of KeysEnd Level 1 Node: Periodic Replacement of Keys
   Start Level 2 Node: Administration of KeysAdministration of KeysEnd Level 2 Node: Administration of Keys
   Start Level 2 Node: Migration to Current Key VersionMigration to Current Key VersionEnd Level 2 Node: Migration to Current Key Version
   Start Level 2 Node: Conversion to Versioned EncryptionConversion to Versioned EncryptionEnd Level 2 Node: Conversion to Versioned Encryption
      Start Level 3 Node: Converting to Versioned EncryptionConverting to Versioned EncryptionEnd Level 3 Node: Converting to Versioned Encryption
      Start Level 3 Node: Replacing KeysReplacing KeysEnd Level 3 Node: Replacing Keys
   Start Level 2 Node: Deleting Data Records That Are Not NeededDeleting Data Records That Are Not NeededEnd Level 2 Node: Deleting Data Records That Are Not Needed