CREATE TABLE table_55013 ("Date" CLOB, "Score" CLOB, "Set 1" CLOB, "Set 2" CLOB, "Set 3" CLOB, "Total" CLOB)

What is the score for set 2 when set 3 was 15 6?
SELECT "Set 2" FROM table_55013 WHERE "Set 3" = '15–6'
SELECT "Set 2" FROM "table_55013" WHERE "Set 3" = '15–6'