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| begrænsning med 2 elementer (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 : 6 a las frases, 4 temas |
| Agricultura | 1 |
| Comunicaciones | 3 |
| Medicina | 1 |
| Tecnología de la información | 1 |