What is "aillarehue"

Aillarehue or Ayllarehue (from the ( mapudungun: ayllarewe/ayjarewe: " nine rehues"); a confederation of rehues or familiar clans ( lof) that dominated a region or province. It was the old administrative and territorial division of the Mapuche, Huilliche and the extinct Picunche people. Aillarehue acted as a unit only on special festive, religious, political and especial military occasions. Several aillarehues formed the Butalmapu, the largest military and political organization of the Mapuche.