CREATE TABLE table_15425 ("Team 1" TEXT, "Agg." TEXT, "Team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What was the score of the second leg with an agg of 4-6?
SELECT "2nd leg" FROM table_15425 WHERE "Agg." = '4-6'
SELECT "2nd leg" FROM "table_15425" WHERE "Agg." = '4-6'