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| Yuan opera (verse popular in the Yuan dynasty) | |||
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元 曲 : 27 phrases in 9 subjects |
| Business | 1 |
| Cryptography | 1 |
| Earth sciences | 4 |
| Electronics | 2 |
| Geology | 1 |
| Geophysics | 1 |
| Mathematics | 2 |
| Oil / petroleum | 1 |
| Technology | 14 |
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