user: Question: What is the total number of wins of the club with a goal difference less than 21, 4 draws, and less than 21 losses?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Real Betis', 34.0, 42.0, 18.0, 6.0, 10.0, 66.0, 42.0, 24.0]
SQL:

assistant: SELECT SUM("Wins") FROM "Table" WHERE "Goal Difference" < 21.0 AND "Draws" = 4.0 AND "Losses" < 21.0;