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Gorgarian
<P>That is a good suggestion too -- I could run the code in blocks, saving up the deletions, and doing a clean-up after each 1M iterations, then restarting the while loop. I will see how much longer it takes to run after restricting myself to deleting only deleting the most recent iteration reference, and if it is a problem, move to your idea as a Plan B.</p>
<p>Thanks for your help. Learning ... :)</p>
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