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enveloppe double : 24 phrases in 11 subjects |
| Astronomy | 1 |
| Chemistry | 4 |
| Earth sciences | 5 |
| Economy | 1 |
| Electronics | 2 |
| Industry | 1 |
| Mechanic engineering | 1 |
| Patents | 2 |
| Technology | 2 |
| Transport | 4 |
| Water resources | 1 |
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