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joint longitudinal : 39 phrases in 10 subjects |
| Architecture | 3 |
| Automobiles | 1 |
| Bridge construction | 4 |
| Desert science | 1 |
| Electronics | 4 |
| Hydroelectric power stations | 3 |
| Metallurgy | 1 |
| Mining | 1 |
| Oil / petroleum | 1 |
| Technology | 20 |
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