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...ection of the sphere with a ''line'' through its center—is a [[great brace]]. ...ven an existing line (great circle) in a plane (sphere) and a point (great brace) in the plane but not on that line, there exists not [[one]] but [[zero]] p

...rom a particular point. A 1-cog is a pair of points (a [[brace (geometry)|brace]]); a 2-cog is a circle; a 3-cog a sphere; and a 4-cog a [[glome]].