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This problem had been studied by Euler.  Rearrange the colored letters below so that each row or column will have four distinct letters having four different colors.

This puzzle is INTERACTIVE in Java-enabled browsers.  

Clicking on any white cell will interchange its content with the content of the green cell.  Use this method repeatedly as you rearrange the letters.  For example, to move the RED A  in the second row to the fourth cell of the last row,  click on the RED A, then click on the the fourth cell of the last row.

click here for a non-Java page

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Bits and Beyond ...


Spirals come in various forms.  They may be logarithmic, equiangular, geometrical, or rectangular spirals.  A lot of natural phenomena or objects manifest spiral properties.  These includes shells, tornadoes, hurricanes, and galaxies.


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