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| beperking met twee elementen (A constraint that applies to two elements, such as two classes or two associations. The constraint is shown as a dashed arrow from one element to the other, labeled by the constraint string in braces ({ })) | |||
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2 : 7 phrases in 6 subjects |
| Agriculture | 1 |
| Communications | 2 |
| Earth sciences | 1 |
| Environment | 1 |
| Information technology | 1 |
| Medical | 1 |