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| στοιχείο Hydrox; στοιχείο Η2Ο2 | |||
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H : 24 phrases in 10 subjects |
| Communications | 3 |
| Earth sciences | 2 |
| Electronics | 3 |
| Environment | 1 |
| General | 2 |
| Health care | 1 |
| Mechanic engineering | 2 |
| Medical | 7 |
| Statistics | 1 |
| Transport | 2 |
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