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12.9.4  Polygonal lines in space: open_polygon

See section 11.10.4 for polygonal lines in the plane.

The open_polygon command takes as arguments a sequence of points.

open_polygon returns and draws the polygon line whose vertices are the given points.

Input:

open_polygon(point(0,0,0),point(0,1,0),
point(0,2,2),point(1,0,2))

Output:


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