Printing the elements of an array in C programming

Question

#include <stdio.h>

int main()
{
    int a[5] = {1,2,3,4,5};
    printf("%d \n", a[1]);
    printf("%d \n", 1[a]);
    
    printf("%d \n", a[2]);
    printf("%d \n", 2[a]);
    return 0;
}

How is the 7th and 10th line of code working?? After executing the program, I got the following result

2 
2 
3
3