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| effectief oppervlak | |||
| effectieve apertuur | |||
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effective area : 19 phrases in 7 subjects |
| Chemistry | 1 |
| Communications | 2 |
| Electronics | 9 |
| Hobbies and pastimes | 3 |
| Industry | 1 |
| Life sciences | 1 |
| Mechanic engineering | 2 |
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