user: Question: What is the 1st leg of the team with a 2-1 agg.?
Columns: ['Team 1', 'Agg.', 'Team 2', '1st leg', '2nd leg']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AS Bilima', '2-1', 'CARA Brazzaville', '1-1', '1-0']
SQL:

assistant: SELECT "1st leg" FROM "Table" WHERE "Agg." = '2-1';