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Let's say you're on an outdoor pizza oven website dreaming about someday owning one. Mmm pizza. Next you switch gears and visit a fitness site; low and behold an ad for the pizza oven you were just looking at is there, too. Then you go to YouTube to see how easy it would be to build your own pizza oven (it's too hard), but first you have to sit through an advertisement about, you guessed it, that same pizza oven.
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