user: Question: What series did the racer earn 68 points in?
Columns: ['Season', 'Series', 'Team', 'Races', 'Wins', 'Poles', 'F/Laps', 'Podiums', 'Points', 'Position']
Types: ['real', 'text', 'text', 'real', 'real', 'real', 'real', 'real', 'text', 'text']
Sample row: [2003.0, 'Formula RUS', "Lukoil-Serebryaniy dojd'-Junior", 14.0, 0.0, 1.0, 1.0, 5.0, '39', '4th']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "Points" = '68';