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| trichotomy | |||
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三分法 : 35 phrases in 11 subjects |
| Aviation | 2 |
| Baseball | 1 |
| Business | 3 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 3 |
| Geophysics | 1 |
| Space | 1 |
| Technology | 19 |
| Water resources | 1 |
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