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apertura della : 19 phrases in 11 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 6 |
| Finances | 1 |
| General | 1 |
| Industry | 3 |
| Insurance | 1 |
| Mechanic engineering | 1 |
| Medical | 1 |
| Metallurgy | 2 |
| Transport | 1 |
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