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Operations and Maintenance : 43 phrases in 14 subjects |
| Aviation | 5 |
| Communications | 17 |
| Economics | 2 |
| Electronics | 2 |
| Environment | 1 |
| Finances | 1 |
| General | 2 |
| Information technology | 3 |
| International Monetary Fund | 1 |
| Name of organization | 1 |
| Telecommunications | 1 |
| Transport | 2 |
| United Nations | 2 |
| Water resources | 3 |