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: "when was pole vault introduced in olympics games?" whose answer is 1896.
Each document should contain about 30 words, and these documents should contain useful information.

Query: history of pole vault in olympics
Useful Output:

Doc 1: Pole vaulting competitions were held by ancient Greeks, Cretans, and Celts. Men's Pole Vaulting has been a competitive event at the Olympic Games since 1896.
Doc 2: The highest pole vault jumps in Olympic history, including Thiago Braz Da Silva's record at Rio 2016.
Doc 3: Comments · Men's Pole Vault Final | Tokyo Replays · Evolution of the Pole Vault Olympic Record! · A moment frozen in time · How Technology has
Doc 4: History of Olympic Results: Pole Vault – Women · 1. Katie Moon (USA), 16-¾ | 4.90 · 2. Anzhelika Sidorova (Russia), 15-11 | 4.85 · 3. Holly
Doc 5: In the 1896 Olympics, the record, set with a bamboo pole, was 10 ft 6 in  Today, the world-record pole vault is over 20 feet (6.1 meters). 1 2 3 4.