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hole centre : 23 phrases in 10 subjects |
| Automobiles | 1 |
| Communications | 2 |
| Electronics | 1 |
| General | 2 |
| Mechanic engineering | 1 |
| Metallurgy | 2 |
| Mining | 2 |
| Polygraphy | 1 |
| Technology | 9 |
| Telegraphy | 2 |
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