public static void getSuccessors(Configuration board, int row, ArrayList<Configuration> successors, int X){
      if(row >= X-1){
        if(isValid(board)){
          successors.add(board);
          return;
        }
      } else {
        for(int i = 1; i < (2 * X)-1; i++){
          for(int j = i+1; j < (2 * X)-1; j++){
            Configuration newBoard = new Configuration(X);
            Arrays.fill(newBoard.getConfiguration()[row], i, j+1, 1);
            System.out.println("NewBoard (Row=" + row + ")");
            System.out.println(newBoard.toString());
            getSuccessors(newBoard, row+1, successors, X);
          }
        }
      }
    }