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 did hungary open its borders with austria?" whose answer is 1989.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did hungary open its borders with austria
Useful Output:

Doc 1: The Pan-European Picnic was the remarkable event on the Hungarian-Austrian border in August 1989, when the border guards of Communist Hungary
Doc 2: Hungary's right-wing government shut the main land route for migrants into the European Union on Tuesday (15 September), aiming to halt a
Doc 3: The border crossing is well-known because it was one of the first crossings between Austria and Hungary to open in 1989. On July 27, 1989,
Doc 4: Thirty years ago this Monday, on 19 August 1989, thousands of Hungarians and Austrians gathered at the border fence between the two countries,
Doc 5: In 1922 a three-sided boundary stone in the shape of a truncated pyramid was erected at the point where Hungary, Austria, and Yugoslavia converged.