Shelly Wu invites you to have fun with this real working abacus:

 
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| If your browser supported Java, |
| you would see the abacus here. |
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Abacus was originally written by Luis Fernandes
with modifications by R.H. Aristotle Davis


If you cannot see the above abacus, you need to get a Java combatible browser.
You can get one from the Java Home Page, or check out Netscape 2.01 here.
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