번호	제목
6405	Paper Folding
6406	Shuffling Patience
6407	String Computer
6408	Stamps
6409	Making Change
6410	The Sultan's Successors
6411	Theseus and the Minotaur
6412	Xenosemantics
6413	Clock Patience
6414	Car Trialling
6415	Mapping the Route
6416	트리인가?
6417	코코넛 그 두 번째 이야기
6418	Nonstop Travel
6419	Doing Windows
6420	Numerically Speaking
6421	It's Ir-Resist-Able
6422	Getting Chorded
6423	Run, Run, Runaround Numbers
6424	Optimal Array Multiplication Sequence