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| солнечный цикл | |||
| цикл солнечной деятельности | |||
| цикл солнечной активности | |||
| solar cycle: 17 phrases in 5 subjects |
| Energy industry | 5 |
| Makarov | 5 |
| Mass media | 2 |
| Solar power | 4 |
| Technology | 1 |
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