What is the output of the following C program?

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#include<stdio.h>
  
int main()
{
  int i, j;
  int arr[4][4] = { {1, 2, 3, 4},
                    {5, 6, 7, 8},
                    {9, 10, 11, 12},
                    {13, 14, 15, 16} };
  for(i = 0; i < 4; i++)
    for(j = 0; j < 4; j++)
      printf("%d ", j[i[arr]] );
  
  printf("\n");
  
  for(i = 0; i < 4; i++)
    for(j = 0; j < 4; j++)
      printf("%d ", i[j[arr]] );
  
  return 0;
}