| 1 | They also learned to use the abacus. | |
| 2 | Yes, we can start the abacus competition. | |
| 3 | Learning abacus made my son more interested in math. | |
| 4 | I've passed the tests of business skills for abacus and shorthand. | |
| 5 | The skit demonstrates the three stages of abacus usage and teaches about changes in the history of computing. |
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