Markets that ask whether a speaker says all of several words, or any of them, are joint-probability questions, and the words are strongly correlated — a speech that mentions tariffs almost certainly mentions China. Traders price these by multiplying independent guesses, which badly underprices the 'all of them' case and overprices 'any'. You estimate the correlation structure from the transcript corpus and trade the bundles against the naive independent price.
Markets on Polymarket where multi-word bundle joint probability is the natural play: