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BackClf, csh, cfn, crn); else if (two_holes_type == "opposite") { } else { rotate_extrude(convexity=10, $fn=fn4) polygon(points=[ [x0,y1],[x1,y1],[x2,y2],[x2,y3],[x1,y4],[x0,y4] ], paths=[ [0,1,2,3,4,5,6,7] ]); } else { // replace the