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: "where does the ohio river start and finish?" whose answer is Pittsburgh, Pennsylvania.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Ohio River start and finish
Useful Output:

Doc 1: The Monongahela River begins in the city of Fairmont in the State of West Virginia at an elevation of 270m. The two rivers meet at Point State
Doc 2: Beginning at Pittsburgh, Pennsylvania, the Ohio is formed by the confluence of the Allegheny and Monongahela Rivers. It ends 981 miles later at
Doc 3: The Ohio River is formed by the confluence of the Allegheny and Monongahela rivers in Pittsburgh, PA. The river is 981 miles long and flows to
Doc 4: Ⅰ The Ohio begins at the confluence of the Allegheny and Monongahela Rivers in. Pittsburgh, Pennsylvania, and ends in Cairo, Illinois, where it flows into the.
Doc 5: The Ohio River begins at Pittsburgh, with the union of the Allegheny and Monongahela rivers. From there the Ohio travels 981 miles to Cairo, Illinois, where it