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| at intervals; now and again; intermittently | |||
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par intervalles : 10 phrases in 7 subjects |
| Isolation | 1 |
| Mathematics | 1 |
| Metallurgy | 1 |
| Pharmacy and pharmacology | 1 |
| Skiing | 1 |
| Statistics | 4 |
| Textile industry | 1 |
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