One of the subjects inside the data is about the three compartmentalized "boxes" inside Sora, each one containing the heart of another person: one box holds Roxas's heart; another one holds Xion's heart, and the third one, which has been with Sora for a much longer time, holds Ventus's heart. These three hearts have melded with Sora's and no longer have voices of their own; as such, attempting to manually extract them from Sora's heart can be just as deadly as becoming a Heartless.
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