On the last page the results of your search come in. You don't have to wait till the end of the search process. They come in as the search continues.
You can choose to delete a file from disk or to remove it from this list.
You can delete all files that are doubles of this files, or remove them all from this list.
You can delete all doubles at once, leaving exact one copy of every double file on your disk. Finddoublefiles is about double files so, whatever you delete always one copy of the double file will stay.
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