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| sistema de apoyo | |||
| sistema auxiliar; sistema de reserva | |||
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sistema di riserva : 13 phrases in 8 subjects |
| Communications | 1 |
| Economy | 1 |
| Electric motors | 1 |
| Electronics | 3 |
| Finances | 2 |
| General | 1 |
| Information technology | 3 |
| Mechanic engineering | 1 |
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