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| operational key; running key; work key; working key | |||
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рабочий ключ : 19 phrases in 8 subjects |
| Communications | 2 |
| Drilling | 7 |
| Information security and data protection | 1 |
| Makarov | 1 |
| Mass media | 2 |
| Mining | 1 |
| Oil / petroleum | 3 |
| Security systems | 2 |
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