group() {
	multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, -10], [0, 0, 0, 1]]) {
		group() {
			difference() {
				rotate_extrude(file = "example007.dxf", layer = "dorn", origin = [0, 0], scale = 1, convexity = 3, $fn = 0, $fa = 12, $fs = 2);
				group() {
					multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
						group() {
							intersection() {
								multmatrix([[1, 0, 0, 0], [0, 0, -1, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
									multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, -50], [0, 0, 0, 1]]) {
										linear_extrude(height = 100, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
											import(file = "example007.dxf", layer = "cutout1", origin = [0, 0], scale = 1, convexity = 1, $fn = 0, $fa = 12, $fs = 2);
										}
									}
								}
								multmatrix([[0, -1, 0, 0], [1, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
									multmatrix([[1, 0, 0, 0], [0, 0, -1, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
										multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, -50], [0, 0, 0, 1]]) {
											linear_extrude(height = 100, center = false, convexity = 2, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
												import(file = "example007.dxf", layer = "cutout2", origin = [0, 0], scale = 1, convexity = 1, $fn = 0, $fa = 12, $fs = 2);
											}
										}
									}
								}
							}
						}
					}
					multmatrix([[0, -1, 0, 0], [1, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
						group() {
							intersection() {
								multmatrix([[1, 0, 0, 0], [0, 0, -1, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
									multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, -50], [0, 0, 0, 1]]) {
										linear_extrude(height = 100, center = false, convexity = 1, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
											import(file = "example007.dxf", layer = "cutout1", origin = [0, 0], scale = 1, convexity = 1, $fn = 0, $fa = 12, $fs = 2);
										}
									}
								}
								multmatrix([[0, -1, 0, 0], [1, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
									multmatrix([[1, 0, 0, 0], [0, 0, -1, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
										multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, -50], [0, 0, 0, 1]]) {
											linear_extrude(height = 100, center = false, convexity = 2, scale = [1, 1], $fn = 0, $fa = 12, $fs = 2) {
												import(file = "example007.dxf", layer = "cutout2", origin = [0, 0], scale = 1, convexity = 1, $fn = 0, $fa = 12, $fs = 2);
											}
										}
									}
								}
							}
						}
					}
				}
			}
		}
	}
}