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| letter of reference | |||
| 调 査 信: 28 phrases in 12 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Business | 2 |
| Construction | 1 |
| Economy | 9 |
| Finances | 2 |
| Intelligence and security services | 1 |
| International trade | 1 |
| Marketing | 1 |
| Oil / petroleum | 3 |
| Technology | 5 |
| Textile industry | 1 |
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