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error -circular : 41 phrases in 14 subjects |
| Agriculture | 1 |
| Aviation | 5 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 3 |
| General | 4 |
| Geophysics | 1 |
| Mathematics | 1 |
| Mechanics | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 11 |
| Technology | 6 |
| United Nations | 2 |
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