If you generate the same keywords to multiple products, you can keep all of them, keep only one or delete them.
1. choose the strategy of what to do with duplicate keywords
2. if you choose the option to add only to one product, choose according what it will be selected
3. choose the method of selection
Remove duplicity words
This setting controls the duplicity of words in one Keyword:
For example we have the keyword "Mattel a blonde doll from Mattel," no matter where this word came from (from the data source or we managed to add brand twice-like a prefix or suffix), but important is that this setting removes any other appearance of the same word. The result will be keyword: "Mattel a blonde doll from"