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planned maintenance : 45 phrases in 14 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 19 |
| Business | 1 |
| Economy | 7 |
| Electronics | 2 |
| Information technology | 2 |
| Management | 1 |
| Metallurgy | 1 |
| Nautical | 2 |
| Project management | 1 |
| Shipbuilding | 1 |
| Space | 4 |
| Technology | 2 |
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