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irreversible : 98 phrases in 28 subjects |
| Analytical chemistry | 4 |
| Armored vehicles | 1 |
| Astronautics | 2 |
| Automated equipment | 2 |
| Aviation | 8 |
| Chemistry | 9 |
| Construction | 4 |
| Economics | 3 |
| Electronics | 5 |
| Forestry | 1 |
| Gear train | 1 |
| General | 1 |
| Information technology | 3 |
| Journalism terminology | 2 |
| Mathematics | 1 |
| Mechanic engineering | 9 |
| Medical | 5 |
| Metallurgy | 5 |
| Microsoft | 1 |
| Military | 3 |
| Nuclear physics | 5 |
| Patents | 1 |
| Physics | 3 |
| Politics | 5 |
| Polygraphy | 1 |
| Radio | 4 |
| Technology | 6 |
| Trucks/Lorries | 3 |