Table schema:
CREATE TABLE table_name_6 (set_1 VARCHAR, set_2 VARCHAR, set_3 VARCHAR)

Question: What is the Set 1 with a Set 2 of 15–5, and a Set 3 with 15–3?
SQL: SELECT set_1 FROM table_name_6 WHERE set_2 = "15–5" AND set_3 = "15–3"