user: Question: What is the smallest season with 6 races, 2 wins, and a Series of All-Japan GT Championship>
Columns: ['Season', 'Series', 'Races', 'Wins', 'Position']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1989.0, 'Spanish Formula Fiat', '7', '2', '1st']
SQL:

assistant: SELECT MIN("Season") FROM "Table" WHERE "Races" = '6' AND "Series" = 'All-Japan GT Championship' AND "Wins" = '2';