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二次 元 : 20 phrases in 10 subjects |
| Aviation | 1 |
| Business | 2 |
| Corporate governance | 1 |
| Cryptography | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Finances | 1 |
| International trade | 1 |
| Mathematics | 3 |
| Technology | 6 |
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