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Draw parallel and perpendicular lines

Any pair of points can be connected by a line segment.
Connect two pairs of black points in a way that creates two perpendicular line segments.
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Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël
Created with Raphaël