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Is that what I suggested in post#2?

You will have to describe what you want to do and post all the code involved in the problem.
The small pieces you have posted are not enough to understand the problem.

To stop a loop from continuing to execute use the break statement to exit the loop.

Not sure what that means. Are the two keys different? By replace I assume you mean you want to remove one key and add the other key with the same value that the first key had.
I also assume that...