You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "How often were the games who the Arrephoros worked to prepare the peplos for held?" whose answer is every four years.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when were the Arrephoros chosen
Useful Output:

Doc 1: Historically, the festival was formalized in 566 BCE under the rule of Peisistratos, who elevated it into a grand occasion reflecting Athenian
Doc 2: Arrephoria (Age 7): -4 girls from noble families are chosen and two are chosen to live in the temple of Athena for 8 months, where they supervise the weavers of
Doc 3: The braziers were found in 1956 and the cooking pot in 1961. Braziers and cooking pot. In the middle of the gallery are two nearly identical
Doc 4: Two maidnes were chosen to carry a basket containing something unknown  ' Arrephoros / as one of the Foundress's Bears / a basket-bearer
Doc 5: Arrhephoria was a feast among the Athenians, instituted in honor of Athena. The word is derived from the Greek term Ἀρρηφόρια.