public String toString() {
		Object obj;
		String result = "[ ";
		SListNode cur = getHead();
		while (cur != null) {
			obj = cur.red;
			result += "{";
			result = result + obj.toString() + ",";
			obj = cur.green;
			result = result + obj.toString() + ",";
			obj = cur.blue;
			result = result + obj.toString() + ",";
			obj = cur.runlength;
			result = result + obj.toString() + "} , ";
			cur = cur.next;
		}
		result = result + "]";
		return result;
	}