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ok...i'll try to translate 1...
A guy wants to send a some stuff in a box to his friend who live in a diffrent city...it can be sent only on the ground...they road is full with criminals so if it's not locked it will get stolen...so he puts a lock on it and sends to his friend...now...how can the friend get what's inside the box (without braking or damaging the lock/box)
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