번호	제목
6321	IBM 빼기 1
6322	직각 삼각형의 두 변
6323	Carbon Dating
6324	URLs
6325	Definite Values
6326	Atlantis
6327	Cog-Wheels
6328	Erdös Numbers
6329	Number Game
6330	Ouroboros Snake
6331	Fold-up Patterns
6332	Railroad
6333	Smith Numbers
6334	Maze
6335	Date bugs
6336	Robbery
6337	Dreisam Equations
6338	Formatting Text
6339	The Game
6340	Dividing