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| ελεύθερο ηχητικό πεδίο; ελεύθερος αέρας | |||
| ελεύθερο πεδίο | |||
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free field : 20 phrases in 8 subjects |
| Communications | 8 |
| Construction | 1 |
| Earth sciences | 4 |
| Electronics | 1 |
| General | 1 |
| Health care | 1 |
| Industry | 1 |
| Natural sciences | 3 |
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