I'm trying to do if the number doesn't exist in combined numbers then it should be dnc

I understand that, but $dnc retains the previous value you assigned every time through the loop, so I wonder if that's what you intended. If you move the declaration and assignment into the loop, $dnc will be an empty string unless the current number doesn't exist in combined numbers.

I don't know if that's what you want though.

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In reply to Re^3: Extracting DNC issues by chromatic
in thread Extracting DNC issues by MoodyDreams999

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