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Assuming that you have two unknown magnets, but you know which direction is north, suspend a magnet from a string or float it in a bowl of water. Mark the end that points north with an "N" and the other end with an "S". Take that magnet and move it near the second magnet. The end of the second magnet that is attracted to the "N" end is the south pole of the second magnet. Mark it with an "S" and the other end with an "N".
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