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| time-dependent; time-varying | |||
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non stationnaire : 26 phrases in 9 subjects |
| Astronomy | 7 |
| Computers | 2 |
| Construction | 4 |
| Earth sciences | 3 |
| Electronics | 4 |
| Mathematics | 3 |
| Metallurgy | 1 |
| Statistics | 1 |
| Technology | 1 |
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