abacus

This app simulates a Chinese abacus (suanpan). With the context menu you can choose between several different colors as well as between ten or thirteen rows of beads. You can also reset the beads of the abacus. If you don't know how to use it you can have a look at thisarticle which explains the basics:http://tuxgraphics.org/giniandkarlsworld/mathblog/abacusexplained.shtml
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Enjoy!