viewimage.php?id=20bcc42e&no=24b0d769e1d32ca73dec8ffa11d02831046ced35d9c2bd23e7054e3c2c8f67b65720432da4482b8df8a02a3a14b4bb908909978e1ae648672f0a763351f2fdabf9fca7d3c57ed122eda7d41c8430a5517dc5

14번에서 s가 저 집합의 원소면 안 돼?

- dc official App