CREATE TABLE table_52876 ("Date" CLOB, "Score" CLOB, "Set 1" CLOB, "Set 2" CLOB, "Set 3" CLOB, "Total" CLOB)

What is the Set 3 with a Set 2 with 15 6?
SELECT "Set 3" FROM table_52876 WHERE "Set 2" = '15–6'
SELECT "Set 3" FROM "table_52876" WHERE "Set 2" = '15–6'