How to visualize the pointers in the code snippet?

I am finding it difficult to visualize this piece of code. I cannot seem to find the ans to this.

I did get the ans for

printf("**r = %d\n",**r);printf("**s = %d\n",**s);

but other variables are not matching the ans. Please help.

int f(int ** r, int ** s) {    int temp = ** r;    int temp2 = **s;    int * z = *r;    *r = *s;    *s = z;    printf("**r = %d\n",**r);    printf("**s = %d\n",**s);    *z += 3;    **s -= 8;    **r -= 19;    return temp + temp2;}int main(void) {    int a = 80;    int b = 12;    int * p = &a;    int * q = &b;    int x = f(&p, &q);    printf("x = %d\n", x);    printf("*p = %d\n", *p);    printf("*q = %d\n", *q);    printf("a = %d\n", a);    printf("b = %d\n", b);    return EXIT_SUCCESS;}

Expected output:

**r = 12**s=80x=92*p=-7*q=75a=75b=-7