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How to determine if any numbers in a series were skipped
In column J of my main data entry sheet, I have a series of case numbers. They all begin with 4 digits for the year, followed by a dash (-), and then 3 digits for the case number (sample: 2026-001, 2026-002, etc). They're supposed to be used consecutively. Each year begins again at '-001'. I have a conditional formatting rule to highlight the number if it has already been used, but now I need a way to determine if a number was skipped. I want the results to be reflected on 'Sheet 1'.
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