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lucas 2 年之前
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README.md

@@ -25,6 +25,7 @@ ___
 - [Chaitin's Constant](https://en.m.wikipedia.org/wiki/Chaitin%27s_constant) *(added 5/12/2023)*
 - [Illegal Number](https://en.m.wikipedia.org/wiki/Illegal_number) *(added 5/12/2023)*
 - [Ring fo Fire](https://en.wikipedia.org/wiki/Ring_of_Fire) *(added 5/12/2023)*
+- [Abacus](https://en.wikipedia.org/wiki/Abacus) *(added 5/12/2023)*
  
 ## [Mathematics and Theoretical Computer Science](mathematics.md)
 - [OEIS: The Online Encyclopedia of Integer Sequences](https://oeis.org/)