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efektywność : 48 phrases in 12 subjects |
| Economy | 4 |
| Electronics | 1 |
| Energy industry | 12 |
| Environment | 7 |
| Finances | 2 |
| General | 1 |
| Mathematics | 12 |
| Microsoft | 2 |
| Obsolete / dated | 1 |
| Statistics | 3 |
| Telegraphy | 1 |
| Transport | 2 |
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