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The Best Test Theory of Extension (BTT) offers a solution to the disjunction problem. According to BTT, the extension of a natural kind term t in a given subject S’s language of thought (LOT) consists of the members of the natural kind that has the highest success rate relative to t. We calculate the success rate of natural kind K relative to S’s term t by dividing the number of times members of K have caused S to token any LOT term whatsoever into the number of times members of K have caused S to token t.