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| système d'exploitation | |||
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sistema de explotacion : 30 phrases in 12 subjects |
| Agriculture | 7 |
| Animal husbandry | 2 |
| Communications | 2 |
| Computer networks | 1 |
| Economics | 3 |
| Finances | 3 |
| General | 3 |
| Information technology | 3 |
| Marketing | 1 |
| Politics | 1 |
| Soil science | 1 |
| Transport | 3 |