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Based on any form of independent drawing by the people the probability will be close to zero. This means that some property of the game has to be used. I have an idea, but proving that it works is kinda hard... University times are a couple of years back -.-
Presuponing the torturer allows the prisoner to rearrange the cards on the envelopes or leaving them stacked in an order that won't be reshuffled before the next prisoner then it is trivial.
No, that's not permitted. Every prisoner is presented with exactly the same envelopes in exactly the same state.
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