I didn't expect it to do this. If you understand why it did what it did, you're half way there.

这样运行的啊，如果你能弄明白为什么,它这么运行，你已经完成了差不多一半了。

麻省理工公开课 - 计算机科学及编程导论课程节选

If you can figure out why fails on three letters instead of 12, you'll be more than half way to solving the problem.

如果你能明白为什么程序,在输入三个字母的单词的时候没法运行,你就已经解决了问题的一半了。

麻省理工公开课 - 计算机科学及编程导论课程节选