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| système à contacts | |||
| groupe de contacts | |||
| контактная система: 12 phrases in 7 subjects |
| Agriculture | 2 |
| Astronomy | 1 |
| Aviation | 1 |
| Electronics | 2 |
| Mathematics | 1 |
| Mechanic engineering | 1 |
| Trucks/Lorries | 4 |
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