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| дружественные числа | |||
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伴数 : 21 phrases in 8 subjects |
| Biology | 1 |
| Electronics | 1 |
| General | 8 |
| Mathematics | 5 |
| Mechanics | 1 |
| Oil processing plants | 1 |
| Shipbuilding | 2 |
| Technology | 2 |
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