If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
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求学新范式：1年制硕士、微凭证与ROI回归。关于这个话题，爱思助手下载最新版本提供了深入分析
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