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A participant selects one of several lock numbers. They associate their lock number with a secret pin code, that they produce on their phone. They get a confirmation code and even a password hint. You predict that password hint. They can even associate that password hint with a word and still you reveal it with 100% accuracy. You can even repeat this effect with different number selections.
1st edition 2016, 3 pages.word count: 603 which is equivalent to 2 standard pages of text