Difficult | Operating System
| Operating System abbr. | |
| IT | besturingsprogramma; besturingssysteem; stuurprogramma |
| operating system abbr. | |
| comp., MS | besturingssysteem; besturingssysteem |
| econ. | besturingssysteem |
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| dfclt; diffy | |||
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Difficult : 21 phrases in 10 subjects |
| Chemistry | 2 |
| Economics | 1 |
| General | 2 |
| Government, administration and public services | 1 |
| Labor law | 2 |
| Law | 2 |
| Life sciences | 2 |
| Marketing | 1 |
| Medical | 3 |
| Transport | 5 |