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Usenet Newsgroups : rec.puzzles Hall of Fame

The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

Hall of Fame
Categories : logic : locks.and.boxes.p

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


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