- 1. Give me an old-fashioned tetragon on a central pivot every time.
- 每次都给我看一个建在中轴上的四角大楼吧。
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- 2. And the shapes vary to hexagon, tetragon, acicular and odd different colors are available.
- 形状有六角形，四角形，长条针形和不规则形状，并有多种颜色可供选择。
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- 3. Combining with the condition of C-partition and tetragon 2-factor, we give new classes of upper-embeddable graphs.
- 联系图的顶点划分和四边形2因子的条件，本文给出了新的上可嵌入的图类。
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- 4. Combining with the condition of C-partition and tetragon 2-factor, we give new classes of upper-embeddable graphs.
- 联系图的顶点划分和四边形2因子的条件，本文给出了新的上可嵌入的图类。
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