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borehole: 65 phrases in 12 subjects |
Coal | 17 |
Construction | 10 |
Earth sciences | 5 |
General | 9 |
Life sciences | 4 |
Measuring instruments | 3 |
Mechanic engineering | 3 |
Metallurgy | 2 |
Natural resourses and wildlife conservation | 1 |
Soil science | 6 |
Technology | 1 |
Transport | 4 |