深度审查（推荐）：在 Ling Studio 里交给 Ring-2.5-1T 做 Code Review，强项是推理严谨与长程上下文。
given a stack of punched cards encoding transactions, they produced a ledger
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Author(s): Yang Li, Zhihui Wang, Wei Zhou, Rui Wang, Haiyan Zhang, Shu Zhan, Jiajia Xu
Number (3): Everything in this light blue space must add up to 3. The answer is 1-2, placed vertically.