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I was talking to a former colleague today, and he showed me Nutrimatic, which is a giant trie of Wikipedia. It captures every phrase in Wikipedia in a sort of straightforward but very clever way. It doesn't have to have any rules about what a phrase is to do this, which makes sense once explained, but never occurred to me as possible before I saw this.
If you search it with .*, you get the phrases in Wikipedia in order of popularity, which are fun to look at.