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| core rig: 12 phrases in 9 subjects |
| Construction | 1 |
| Drilling | 1 |
| Electronics | 1 |
| Energy industry | 1 |
| Oil / petroleum | 4 |
| Oil and gas | 1 |
| Oilfields | 1 |
| Seismology | 1 |
| Technology | 1 |
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