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wall pipe : 55 phrases in 10 subjects |
| Drilling | 5 |
| Earth sciences | 1 |
| Engineering geology | 3 |
| Hydroelectric power stations | 1 |
| Mechanics | 1 |
| Metallurgy | 17 |
| Oil / petroleum | 10 |
| Plastics | 3 |
| Steel production | 2 |
| Technology | 12 |
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