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standard maintenance : 23 phrases in 10 subjects |
| Aviation | 5 |
| Business | 2 |
| Commerce | 1 |
| Economy | 2 |
| Electronics | 2 |
| General | 2 |
| Oil / petroleum | 1 |
| Rail transport | 2 |
| Technology | 5 |
| United Nations | 1 |
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