CSV format change

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I have a csv file with almost 36000 rows.The format of csv file is x,y,Points in each polygon number, Elevation. I would like to arrange this csv file in the below mentioned format. Let’s say in this example, Polygon number 4, 5, 6 points are in the 3rd column. I would like to take x,y,z of the polygon 4 vertices and write 3 before it starts that polygon and END at the end of the polygon vertices.

Input CSV



Output CSV





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