Medium difficulty hints, answers for Feb. 27 PipsNumber (4): Everything in this space must add up to 4. The answer is 2-1, placed horizontally; 2-2, placed vertically.
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。业内人士推荐旺商聊官方下载作为进阶阅读
UPDATE: Read the solution here，这一点在Line官方版本下载中也有详细论述
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