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| reference group (A group that is associated with another group so that their properties and the properties of the groups and fields they contain always match. If the properties of one group are changed, the other group is updated automatically) | |||
| control group | |||
| reference group | |||
| grupo de referencia: 9 phrases in 5 subjects |
| Economy | 1 |
| Electronics | 1 |
| Health care | 1 |
| Transport | 1 |
| United Nations | 5 |