user: Question: Where did the team of rahal letterman in 2006 start?
Columns: ['Year', 'Chassis', 'Engine', 'Start', 'Finish', 'Team']
Types: ['real', 'text', 'text', 'real', 'real', 'text']
Sample row: [2005.0, 'Panoz', 'Honda', 4.0, 4.0, 'Rahal Letterman']
SQL:

assistant: SELECT "Start" FROM "Table" WHERE "Team" = 'rahal letterman' AND "Year" = 2006.0;