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 river that powers the dam in Parana Brazil forms the boundary between what countries?" whose answer is Argentina and Brazil.
Each document should contain about 30 words, and these documents should contain useful information.

Query: "dam in Parana Brazil"
Useful Output:

Doc 1: The international river Paraná flows through Brazil, Paraguay and Argentina, and holds two major binational dams: the upstream ITAIPU dam
Doc 2: The Itaipu dam and the hydroelectric plant are on the Paraná River. The construction of the dam began in February 1971 and cost $19.6bn. The
Doc 3: Itaipú Dam, hollow gravity dam on the Alto (Upper) Paraná River at the Brazil-Paraguay border. It is located north of the town of Ciudad del Este, Paraguay.
Doc 4: The Itaipu hydroelectric dam is a joint venture of Brazil and Paraguay in the upper region of the Paraná River. Even though the dam is owned
Doc 5: In the decades prior to the Itaipú dam construction, large swathes of native forest on the Brazilian side of the Paraná river were cleared