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| contrainte à 2 éléments (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 : 17 a las frases, 11 temas |
| Agricultura | 2 |
| Ambiente | 1 |
| Ciencias de la tierra | 2 |
| Comunicaciones | 2 |
| Cuidado de la salud | 1 |
| Estadísticas | 3 |
| General | 2 |
| Medicina | 1 |
| Microsoft | 1 |
| Química | 1 |
| Tecnología de la información | 1 |