Explain this code to me in English

Code:

---

#include <iostream>
using namespace std;

int main()
{
  int a[]={1,2,3,4};
  int *arr[5]={a,a+1,a+2,a+3,a+4};
  int *p=a+4;
  cout<<p[*arr[1]-5];
  return 0;
}

---

I was solving the programming question when I encountered this.
My answer to this code was a printed garbage value. But, turns out the answer is 2.

English and a picture:

After initializing a, arr and p you have:

Attachment 16296

*arr[1] will give you 2, since p points after the last element of a, p[2-5] will give you p[-3]. This gives you 2 also.