CREATE TABLE table_204_324 (id DECIMAL, "team 1" TEXT, "agg." TEXT, "team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

who were the 6 teams to play in the first leg of the 2011 caf u-23 championship qualification ?
SELECT "team 1", "team 2" FROM table_204_324 WHERE NOT "1st leg" IS NULL
SELECT "team 1", "team 2" FROM "table_204_324" WHERE NOT "1st leg" IS NULL