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 a previous president and chief executive of TNK-BP replace Tony Hayward?" whose answer is 1 October 2010.
Each document should contain about 30 words, and these documents should contain useful information.

Query: previous CEO of TNK-BP before Tony Hayward
Useful Output:

Doc 1: The softly spoken American was himself the former chief executive of TNK-BP before he was forced out of the country by the Kremlin two years ago
Doc 2: BP said Tony Hayward would stand down in October, to be replaced by American Bob Dudley, as it unveiled a US$17 billion quarterly loss beause of
Doc 3: Tony Hayward, who became the face of BP's flailing efforts to contain the massive Gulf oil spill, will step down as chief executive in
Doc 4: Channel 4 News understands BP's embattled chief executive Tony Hayward  Best known as former chief executive of BP's 50:50 Russian venture TNK
Doc 5: Now the former geologist is set to resign. Hayward is to step down from the company's top job in October. He will then be offered a post at the