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| longs and shorts (при сигнализации по азбуке Морзе) | |||
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тире и точки : 12 phrases in 8 subjects |
| Cartography | 1 |
| Communications | 2 |
| Forestry | 2 |
| General | 2 |
| Makarov | 2 |
| Mechanic engineering | 1 |
| Rail transport | 1 |
| Telecommunications | 1 |
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