Number (12): Everything in this space must add up to 12. The answer is 2-6, placed vertically; 6-1, placed vertically.
简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。。关于这个话题，heLLoword翻译官方下载提供了深入分析
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