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flat-topped : 39 phrases in 12 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Bridge construction | 1 |
| Desert science | 2 |
| Drilling | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| Engineering geology | 4 |
| Geology | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 3 |
| Technology | 20 |
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