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| сердцевина коричнево-черноватой окраски (порок древесины) | |||
| чёрная сердцевина (чугуна) | |||
| cœur noir: 6 phrases in 3 subjects |
| Forestry | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 4 |
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