# exact cover

> disjoint family of sets, drawn from a larger collection, with the same union as the whole collection

**Wikidata**: [Q388260](https://www.wikidata.org/wiki/Q388260)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Exact_cover)  
**Source**: https://4ort.xyz/entity/exact-cover


## References

1. Freebase Data Dumps. 2013
2. Reducibility among combinatorial problems. 1972