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Fig.3.4. The method of curve generation (base geometry of strips) is to provide groups of points which are positioned up and down to create interpolated curves out of them. Since strips are mirrored one after each other, there should be two lists of points one to generate a Sine-Graph, and another, a literally Minus (-) Sine-Graph.
Fig.3.5. Two separate lists of points, yet without any support for corrugation.