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OK, you have a book that fits into two series. Let's call them A & B. Now you have two series columns. The original series columns and the new one called series2. To search using the series column names, you have to have a much more complex search as you have to search 4 times basically. You have to have each column search done twice to find if that column has A or B. Then you have to do the same thing again. Would it not be easier for the user to allow two series in the already existing series column instead of making searching more complicated?
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