번호	제목
6450	Channel Allocation
6451	Alien Security
6452	Octal Fractions
6454	Trip Routing
6455	Transaction Processing
6456	Perfect Hash
6457	Pascal Program Lengths
6458	Circle Through Three Points
6460	Pizza Anyone?
6461	Adam's Genes
6462	Risk
6463	팩트
6464	Horse Shoe Scoring
6465	Stats
6467	Prime Cuts
6468	Gears on a Board
6469	Uniform Generator
6470	Excuses, Excuses!
6473	Unix ls
6474	Palindromes