번호	제목
27673	Ultimate magic rectangles (Hard)
27674	A+B
27675	Dijkstra's Nightmare (Hard)
27676	Dijkstra's Nightmare (Easy)
27677	Familiar Couples
27678	Humble Captains
27679	Solitaire
27680	Town
27681	Unusual Game Show
27682	Adjusting passwords
27683	Beating the game (Easy)
27684	Beating the game (Hard)
27685	Copier
27686	Game on a conveyor belt
27687	Intrepid cave explorer
27688	Maximum enjoyment
27689	Two covers
27690	Boredom buster (Easy)
27691	Boredom buster (Hard)
27692	Exploring the cave