user: Question: How many fast laps are in 6 races with 30 points in the World Series by Nissan?
Columns: ['Season', 'Series', 'Team', 'Races', 'wins', 'Fast laps', 'Points', 'Pos.']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2001', 'Formula One', 'Prost', 'Test driver', 'Test driver', 'Test driver', 'Test driver', 'Test driver']
SQL:

assistant: SELECT SUM("Fast laps") FROM "Table" WHERE "Series" = 'World Series by Nissan' AND "Races" = '6' AND "Points" = '30';