user: Question: what is the play-off in group stage 4 and clubs is 12
Columns: ['Pos', 'Member Association', 'Points (total 500)', 'Clubs', 'Group stage', 'Play-off', 'AFC Cup']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: [4.0, 'Saudi Arabia', 365.0, 12.0, 4.0, 0.0, 0.0]
SQL:

assistant: SELECT "Play-off" FROM "Table" WHERE "Group stage" = 4.0 AND "Clubs" = 12.0;