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When EiE_iEi occurs, all the points are packed into a 180° arc starting at point iii. The remaining arc (the gap going counterclockwise back to iii) is at least 180°. Now suppose some other point jjj also tried to be an anchor. Point jjj's clockwise semicircle is exactly 180°. But to contain all the points, it would need to bridge that gap of 180° or more while simultaneously containing point iii on the other side. A 180° arc cannot straddle a 180° gap. So EjE_jEj cannot hold.
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看上去，没有绝对的安全赛道，只有适配自身的节奏，魅族的三线作战，似乎是在避开与巨头正面硬刚，走差异化赋能路线，在细分领域建立壁垒。