1、取一张正方形，折成如下形状
3、将一边顺顶点与焦点重合，另三边同样
7、其它三面也按同样的方法折
8、将一角向下折，上边对齐，展开得到一条折痕，顺折痕向上折，折出如下
10、顺着折痕向上盘折，将顶角拎在一起
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