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: "The positions of the feet in ballet is a fundamental part of classical ballet technique that defines standard placements of feet on the floor, two additional positions, known as the sixth and seventh positions, were codified in the 1930s by Serge Lifar, who was a French ballet dancer and choreographer of Ukrainian origin, famous as one of the greatest male ballet dancers of which century?" whose answer is 20th.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Serge Lifar famous century
Useful Output:

Doc 1: Serge Lifar was one of the greatest ballet dancers and choreographers of the 20th century. He was introduced to dance in 1920 by Bronislava
Doc 2: He was one of the greatest male ballet dancers of the 20th century and considered the successor to Nijinsky in the Ballet Russes. From 1930 on,
Doc 3: Considered one of the greatest ballet dancers of the 20th century. The Serge Lifar Foundation was created in his memory in 1989. See Also.
Doc 4: Lifar, whose contemporaries called the “God of Dance,” stands among the most prominent figures of twentieth-century European art, and as a
Doc 5: Serge Lifar (1905-1986) was a significant figure in the world of ballet, known for his roles as a dancer, choreographer, and theorist.