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| уровень прочности | |||
| strength level: 17 phrases in 7 subjects |
| Metallurgy | 5 |
| Military | 1 |
| Oil / petroleum | 1 |
| Sakhalin | 5 |
| Sakhalin R | 2 |
| Seismology | 2 |
| Technology | 1 |
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