List out all the medals won by Lee Chong Wei.
medals refer to medal_id where medal_id <> 4;
SELECT DISTINCT T1.medal_name FROM medal AS T1 INNER JOIN competitor_event AS T2 ON T1.id = T2.medal_id INNER JOIN games_competitor AS T3 ON T2.competitor_id = T3.id INNER JOIN person AS T4 ON T3.person_id = T4.id WHERE T4.full_name = 'Lee Chong Wei' AND T2.medal_id <> 4