 |
| stratification: 67 phrases in 17 subjects |
| Agriculture | 2 |
| Chemistry | 4 |
| Coal | 2 |
| Construction | 3 |
| Earth sciences | 3 |
| Economy | 1 |
| Environment | 2 |
| General | 2 |
| Industry | 2 |
| Life sciences | 10 |
| Mathematics | 6 |
| Metallurgy | 17 |
| Natural resourses and wildlife conservation | 4 |
| Natural sciences | 2 |
| Social science | 3 |
| Statistics | 2 |
| Transport | 2 |