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| разность арифметической прогрессии | |||
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通 : 195 phrases in 10 subjects |
| Astronomy | 1 |
| Aviation | 1 |
| Communications | 1 |
| Mining | 1 |
| Nautical | 2 |
| Rail transport | 3 |
| Shipbuilding | 1 |
| Technology | 176 |
| Telephony | 3 |
| Textile industry | 6 |
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