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- inverse constraint (Q21510855): type of constraint for Wikidata properties: used to specify that the referenced item has to refer back to this item with the given inverse property → child
- single-value constraint (Q19474404): type of constraint for Wikidata properties: used to specify that this property generally contains a single value per item
- contemporary constraint (Q25796498): type of constraint for Wikidata properties: used to specify that the subject and the object have to coincide or coexist at some point of history
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