user: Question: What is the 1st leg that has a 2nd leg of 0–0 of Olympique Khouribga?
Columns: ['Team 1', 'Agg.', 'Team 2', '1st leg', '2nd leg']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Etoile du Sahel', '2–0', 'Espérance', '2–0', '0–0']
SQL:

assistant: SELECT "1st leg" FROM "Table" WHERE "2nd leg" = '0–0' AND "Team 1" = 'Olympique Khouribga';