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fréquentielle : 28 phrases in 10 subjects |
| Astronautics | 1 |
| Chemistry | 1 |
| Computers | 1 |
| Electrical engineering | 2 |
| Electronics | 3 |
| Mathematics | 1 |
| Mechanic engineering | 1 |
| Physics | 3 |
| Radio | 12 |
| Technology | 3 |
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