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I'm not sure how many, and I've never later purchased the actual book I got free (which would make no sense to me), but if I enjoy a free book (not counting the public domain ones), I'll either buy more in the series or more by the same author since I do like to support authors I enjoy so they can keep writing. Giving away books has resulted in plenty of sales in my case.
I also have a ton of free books I haven't read yet, since if it is at all interesting I will pick it up while it's free, since sometimes free just last a few hours.
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