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You want to send a valuable object to a friend.  You have a box to contain the object.  The box has a locking ring which is more than large enough
to have a lock attached. You and your friend have several locks with keys.  But your friend does not have the key to any
lock that you have, and vice versa.  How do you do it?  Note that you cannot send a key
in an unlocked box, since it might be copied.

[[RecPuzzlesLocks and Boxes Solution]]
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