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| direct systeem | |||
| direct stelsel | |||
| direct system: 26 phrases in 12 subjects |
| Agriculture | 2 |
| Communications | 5 |
| Earth sciences | 3 |
| Electronics | 5 |
| Environment | 3 |
| Finances | 1 |
| General | 1 |
| Life sciences | 1 |
| Materials science | 1 |
| Natural sciences | 1 |
| Security systems | 2 |
| Transport | 1 |
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