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| English thesaurus | |||
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| DOS | |||
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Difficult : 34 phrases in 14 subjects |
| Astronomy | 1 |
| Chemistry | 2 |
| Economics | 1 |
| General | 1 |
| Geography | 1 |
| Government, administration and public services | 1 |
| Labor law | 3 |
| Law | 3 |
| Life sciences | 1 |
| Marketing | 2 |
| Medical | 9 |
| Metallurgy | 3 |
| Packaging | 1 |
| Transport | 5 |