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type series : 44 phrases in 14 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 3 |
| Business | 1 |
| Electric machinery | 5 |
| Electronics | 1 |
| Mathematics | 6 |
| Mechanic engineering | 1 |
| Mechanics | 1 |
| Nautical | 2 |
| Oil / petroleum | 3 |
| Space | 1 |
| Statistics | 9 |
| Technology | 9 |
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