group() {
	linear_extrude(file = "", cache = "0.0", layer = "", height = 20, origin = [ 0 0 ], scale = 1, center = false, convexity = 1, $fn = 0, $fa = 12, $fs = 1) {
		projection(cut = false, convexity = 0) {
			sphere($fn = 0, $fa = 12, $fs = 1, r = 10);
		}
	}
	multmatrix([[1, 0, 0, 22], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(file = "", cache = "0.0", layer = "", height = 20, origin = [ 0 0 ], scale = 1, center = false, convexity = 1, $fn = 0, $fa = 12, $fs = 1) {
			projection(cut = true, convexity = 0) {
				multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 9], [0, 0, 0, 1]]) {
					sphere($fn = 0, $fa = 12, $fs = 1, r = 10);
				}
			}
		}
	}
	multmatrix([[1, 0, 0, 44], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		linear_extrude(file = "", cache = "0.0", layer = "", height = 20, origin = [ 0 0 ], scale = 1, center = false, convexity = 1, $fn = 0, $fa = 12, $fs = 1) {
			projection(cut = true, convexity = 0) {
				multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 7], [0, 0, 0, 1]]) {
					sphere($fn = 0, $fa = 12, $fs = 1, r = 10);
				}
			}
		}
	}
}