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 east germany and west germany unite?" whose answer is 1990.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did east germany and west germany unite
Useful Output:

Doc 1: As Germany commemorates three decades as a united country, most people on both sides of the former border consider the reunification project a success.
Doc 2: The growing collapse of the Warsaw Pact and Soviet Union made it possible for East Germany to join with West Germany. One aspect of the East
Doc 3: On this day in 1990, the legislative chambers of both West and East Germany voted overwhelmingly in favor of unification.
Doc 4: Reunification since 3rd October 1990 and the beginning of free and peaceful Europe. The reunification would not have been possible without
Doc 5: The political process towards the reunification of East and West Germany started within weeks, and was made official on 3rd October 1990, less