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| hammer blow: 19 phrases in 10 subjects |
| Automated equipment | 2 |
| Construction | 1 |
| Drilling | 2 |
| General | 2 |
| Geophysics | 2 |
| Gyroscopes | 1 |
| Mining | 1 |
| Oil / petroleum | 2 |
| Technology | 4 |
| Tools | 2 |
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