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| Festfilter n | |||
| English thesaurus | |||
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| FF (Alex Lilo) | |||
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fixed filter : 11 phrases in 8 subjects |
| Construction | 2 |
| Environment | 1 |
| General | 1 |
| Measuring instruments | 2 |
| Natural resourses and wildlife conservation | 1 |
| Nuclear physics | 2 |
| Physical sciences | 1 |
| Technology | 1 |