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hole flow : 26 phrases in 10 subjects |
| Electronics | 1 |
| Energy industry | 1 |
| Geology | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 4 |
| Oil and gas | 11 |
| Oil and gas technology | 1 |
| Oilfields | 2 |
| Silicate industry | 1 |
| Technology | 3 |
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