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| grade coal: 26 phrases in 10 subjects |
| Chemistry | 1 |
| Coal | 1 |
| Energy industry | 3 |
| Geology | 5 |
| Makarov | 3 |
| Metallurgy | 3 |
| Mining | 2 |
| Nautical | 1 |
| Technology | 4 |
| Thermal engineering | 3 |
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