1. 前置环境要求 (Prerequisites)
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，这一点在爱思助手下载最新版本中也有详细论述
Worth noting here is that Chrome itself limits this to 16x. The HTML spec has no mandated cap but since this is Chromium extension; the constraint stands.
Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-4, placed vertically.