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| bottom surface (Alexander Demidov) | |||
| нижняя плоскость: 21 phrases in 12 subjects |
| Astronautics | 4 |
| Automated equipment | 3 |
| Construction | 1 |
| Dentistry | 1 |
| Forestry | 1 |
| Geology | 4 |
| Makarov | 2 |
| Medical | 1 |
| Nautical | 1 |
| Oil and gas technology | 1 |
| Seismology | 1 |
| Wood processing | 1 |