group() {
	group() {
		difference() {
			sphere($fn = 0, $fa = 12, $fs = 2, r = 25);
			group() {
				multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					cylinder($fn = 0, $fa = 12, $fs = 2, h = 62.5, r1 = 12.5, r2 = 12.5, center = true);
				}
			}
			group() {
				multmatrix([[1, 0, 0, 0], [0, 0, -1, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
					cylinder($fn = 0, $fa = 12, $fs = 2, h = 62.5, r1 = 12.5, r2 = 12.5, center = true);
				}
			}
			group() {
				multmatrix([[0, 0, 1, 0], [0, 1, 0, 0], [-1, 0, 0, 0], [0, 0, 0, 1]]) {
					cylinder($fn = 0, $fa = 12, $fs = 2, h = 62.5, r1 = 12.5, r2 = 12.5, center = true);
				}
			}
		}
	}
}