I saw a book like 5 minutes ago and I'm writing an sms to a friend: "I just saw a book. I haven't seen one of those since we were kids." "I just saw a book. I didn't see one of those since we were kids." "I just saw a book. I hadn't seen one of those since we were kids." Which of them are okay and which of them are impossible to say? They all sound fine to me. Thanks.
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