 |
| permeability factor: 27 phrases in 10 subjects |
| Construction | 1 |
| Geology | 1 |
| Immunology | 4 |
| Makarov | 1 |
| Medical | 7 |
| Nautical | 7 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
| Technology | 3 |
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