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I think in some cases so call Cardboard Prison are so easy to get out of because of the Rules. Unless Their corrupt, most who work in the penal system must follow certain rules. So-called [[Supervillain]]s don't follow rules and may exploit them for a chance to break free themselves, or have a outside ally do it. Even with an [[Oubliette]] the only way to stop the villain is the either kill the villain, which is sometimes not an option, or become a Knight Templar like jailer to hold them.
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