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Normal processing for the checkin of an updated file:
 | If the old data file has a .a extension, the updated data file is copied into the file system as a .b |
 | The old .a and new .b files are compared, and the difference (delta) saved in the 'log' file |
 | The 'log' file's internal reference is changed to reference the new .b data file. |
 | The old 'data' .a file is deleted, leaving the new 'data' .b file. |
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