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    Compare if identical value in all 7 columns

    I have a spreadsheet of hundreds of MAC addresses in 12 columns. I want to check that every column has the exact same list. As an example, let's say four columns with five values each, like this. Note that one row has XXX. 123 ABC F7F CDC 123 ABC F7F CDC 123 XXX F7F CDC 123 ABC F7F...

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