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This is an update to a solution that I uploaded last month regarding GetNthRecord to gather serial numbers into a return-separated list. The example shows how to store the serial numbers for a found set, so that the found set can then be restored at any time in the future. The update in this version shows how to implement the solution with tail-recursion. This removes the limit of 10,000 recursions but slows down the processing. It's a good variation to inspect and learn from. These techniques are all shown from within an example of saving and restoring found sets.