Number (6): Everything in this space must add up to 6. The answer is 3-3, placed vertically.
Chris Wilson is extraordinary: 1,242 fixes at 0.5 years average. He's finding bugs 4x faster than the global average. Ville Syrjälä is similar at 0.8 years.，这一点在51吃瓜中也有详细论述
// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错，推荐阅读体育直播获取更多信息
Author(s): Shinji Sakane, Tomohiro Takaki