 |
| discontinuity point: 17 phrases in 9 subjects |
| Aviation | 1 |
| Construction | 1 |
| Drilling | 1 |
| Makarov | 4 |
| Mathematics | 4 |
| Mechanic engineering | 1 |
| Oil / petroleum | 1 |
| Physics | 2 |
| Rail transport | 2 |
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