public static String showTable(List<String> ids ,List<TrigerState[]> signals){
        String result = "";
        for (int i = 0; i < ids.size(); i++) {
            result += ids.get(i) +" ";
        }
        result += "\n";
        
        for (int i = 0; i < signals.size(); i++) {
            for (int j = 0; j < signals.get(i).length; j++) {
                result += signals.get(i)[j] + "  ";
            }
            result += "\n";
        }
        return result;
    }