索非亚 使者 专辑：索非娅 SOPHIA 语种：国语 发行时间：2005-09-05 本歌词于吾爱知道收集www.qkoufu.com
Given the triangle with vertices (a,b,c): c /\\ /\\ /\\ a----b Which is then subdivided into four triangles by halving each of the edges:
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