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przypadkowy : 15 phrases in 10 subjects |
| Chemistry | 1 |
| Electric motors | 1 |
| Electronics | 6 |
| Environment | 1 |
| Fish farming pisciculture | 1 |
| Forestry | 1 |
| General | 1 |
| Mathematics | 1 |
| Radiology | 1 |
| Telegraphy | 1 |
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