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backflow : 44 phrases in 19 subjects |
| Aerohydrodynamics | 2 |
| Architecture | 1 |
| Astronautics | 9 |
| Chromatography | 1 |
| Combustion gas turbines | 1 |
| Construction | 3 |
| Ecology | 4 |
| Electrical engineering | 1 |
| Electronics | 1 |
| Energy industry | 1 |
| Makarov | 1 |
| Medical | 2 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
| Sakhalin R | 1 |
| Technology | 8 |
| Tengiz | 4 |
| Well control | 1 |