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Equal (3): Everything in this red space must be equal to 3. The answer is 3-6, placed horizontally; 0-3, placed horizontally; 3-5, placed horizontally.，这一点在新收录的资料中也有详细论述
，详情可参考新收录的资料
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print pdf.render。业内人士推荐新收录的资料作为进阶阅读