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| vacance dans le réseau | |||
| trou dans le réseau | |||
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вакансия решётки : 10 phrases in 7 subjects |
| Chemistry | 2 |
| Electronics | 1 |
| Metallurgy | 2 |
| Mineralogy | 1 |
| Physics | 2 |
| Radio | 1 |
| Technology | 1 |
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