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import java.util.Arrays;

class Main {
  public static void main(String[] args) {
    System.out.println(Arrays.toString(swapitem(lst, 3, 1)));
  }
  static int[] lst = {2, 3, 1, 5, 6, 7};
  static int[] swapitem(int[] x, int y, int z) {
        int temp = x[y];
        x[y] = x[z];
        x[z] = temp;
        return x;
    }
}