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| operational security (for operational security reasons – по соображениям оперативной безопасности Alex_Odeychuk) | |||
| operations security | |||
| оперативная безопасность: 16 phrases in 7 subjects |
| Aviation | 1 |
| Corporate governance | 2 |
| Medical | 1 |
| Military | 8 |
| Sakhalin | 1 |
| Security systems | 2 |
| Technology | 1 |
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