They're doing this sort of thing a lot more often, it seems like, whether through manual actions targeting specific sites or algorithm changes that suddenly take a high quality top ranked page and disappear it from results entirely. It's happened to me where I had the most relevant result for a search term (in fact, it's the website that popularized that term) and now it's gone from all Google results. It's still the top result on every other search engine, but I've been unable to get it back at all on Google.
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