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| sistema de niveles | |||
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Level Systems : 23 phrases in 13 subjects |
| Agriculture | 2 |
| Automobiles | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Finances | 1 |
| General | 3 |
| Information technology | 3 |
| Meteorology | 1 |
| Name of organization | 1 |
| Natural sciences | 1 |
| Technology | 2 |
| Transport | 2 |
| United Nations | 2 |