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大師至極限
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First volume: full price. Second: −30%. Third and following: −50%.
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150 puzzles with solutions in a downloadable PDF collection. Edition: 繁體中文.
每冊 150 題數和:大師 75 題、極限 75 題。深入分析候選數與整段排列,再練習用假設導出矛盾。附清楚說明及完整解答,全系列共五冊,可隨時列印。
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