group() {
	intersection();
	intersection();
	intersection() {
		sphere($fn = 0, $fa = 12, $fs = 2, r = 5);
		multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 3], [0, 0, 0, 1]]) {
			cube(size = [4, 4, 6], center = true);
		}
	}
	multmatrix([[1, 0, 0, 0], [0, 1, 0, 12], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			cylinder($fn = 0, $fa = 12, $fs = 2, h = 12, r1 = 4, r2 = 4, center = true);
		}
	}
	multmatrix([[1, 0, 0, 12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			cylinder($fn = 0, $fa = 12, $fs = 2, h = 12, r1 = 4, r2 = 4, center = true);
			multmatrix([[0, 0, 1, 0], [0, 1, 0, 0], [-1, 0, 0, 0], [0, 0, 0, 1]]) {
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 12, r1 = 4, r2 = 4, center = true);
			}
		}
	}
	multmatrix([[1, 0, 0, 12], [0, 1, 0, 12], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 7.01], [0, 0, 0, 1]]) {
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 4, r1 = 4, r2 = 4, center = true);
			}
		}
	}
	multmatrix([[1, 0, 0, 24], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			multmatrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 6.99], [0, 0, 0, 1]]) {
				cylinder($fn = 0, $fa = 12, $fs = 2, h = 4, r1 = 4, r2 = 4, center = true);
			}
		}
	}
	multmatrix([[1, 0, 0, -12], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			multmatrix([[1, 0, 0, 0], [0, 1, 0, -10], [0, 0, 1, -10], [0, 0, 0, 1]]) {
				cube(size = [10, 10, 10], center = true);
			}
		}
	}
	multmatrix([[1, 0, 0, -12], [0, 1, 0, 12], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		intersection() {
			cube(size = [10, 10, 10], center = true);
			multmatrix([[1, 0, 0, 0], [0, 1, 0, -9.99], [0, 0, 1, -9.99], [0, 0, 0, 1]]) {
				cube(size = [10, 10, 10], center = true);
			}
		}
	}
}