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interval method : 19 phrases in 10 subjects |
| Business | 1 |
| Computers | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Information technology | 1 |
| Oil / petroleum | 3 |
| Rail transport | 2 |
| Space | 1 |
| Sports | 2 |
| Technology | 6 |
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