(Q7857666)
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Wikipedia(6 entries)
- amwiki አስራ ሁለቱ መንገዶች
- enwiki Twelvefold way
- jawiki 写像12相
- kowiki 12정도
- ruwiki Двенадцатеричный путь
- svwiki Tolvfaldiga vägen
systematic classification of 12 related enumerative problems concerning two finite sets