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: "Which single seater auto-racing formula did 1977 Can-Am season series used?" whose answer is Formula 5000.
Each document should contain about 30 words, and these documents should contain useful information.

Query: 1977 Can-Am season formula
Useful Output:

Doc 1: Making the new Embassy Hill Formula 1 car at the factory with Graham Hill.
Doc 2: With a few notable exceptions, almost every team by 1977 was using the venerable 3 litre Cosworth DFV engine, mated to a 5 or possibly 6 speed
Doc 3: With Williams in need of a driver for the 1977 Japanese Grand Prix, successful Formula 2000 racer Kuwashima was chosen, only to be replaced by
Doc 4: It was the resurgence of Cam Am racing after an absence of 2 years from the racing calendar  The Rebirth of Walter Wolf's 1977 CAN-AM WD1 Story
Doc 5: For the 1977 racing season, the Sports Car Club of America's (SCCA) “new” Can-Am series used the same single seat chassis used in Formula 5000