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| βάση αναφοράς | |||
| βάση για γεωδαισία | |||
| βασική περίοδος; περίοδος αναφοράς | |||
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base de referencia : 4 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 1 |
| Environment | 1 |
| Information technology | 1 |
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