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HKMO1516GCQ1
Suppose there are three different parallel lines, L1, L2 and L3.
Construct an equilateral triangle with only one vertex lies on each of three parallel lines.
假設有三條不同的平行線， L1、L2 及 L3。
構作一個等邊三角形，其中每條平行線只會有一個頂點存在。