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| optischer Effekt | |||
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оптический эффект : 12 phrases in 8 subjects |
| Astronomy | 2 |
| Aviation | 1 |
| Medical appliances | 1 |
| Microelectronics | 1 |
| Polymers | 1 |
| Public utilities | 1 |
| Technology | 4 |
| Textile industry | 1 |
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