user: Question: what is the f/laps when the season is 2011 and races is 18?
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'F/Laps', 'Podiums', 'Points', 'Pos.']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2003', 'British Formula Three season', 'Promatecme UK / Team SYR', '24', '0', '0', '0', '0', '30.5', '16th']
SQL:

assistant: SELECT "F/Laps" FROM "Table" WHERE "Season" = '2011' AND "Races" = '18';