Villarceau circle & 痕跡 

    立體圖形
    Name
    		 補 充
    		torus-1
    		torus-2
    		Villarceau circle
    		Villarceau circle-2
    		Villarceau circle-3

    Prismatic Ring
     
    		4 tangent cycles and their inverse
    		3D Coaxal circles
    		3D Coaxal circles-2
    		3D Coaxal circles-3
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