So i to any multiple of 4 -- let me write this generally -- so if you have i to any multiple of 4, so this right over here is, well we'll just restrict k to be non negative right now; k is greater or equal to zero so if we have i to any mutiple of 4 right over here we are going to get, we are going to get 1 because this is the same thing as i to the fourth power to the kth power and that is the same thing as 1 to the kth power which is clearly equal to 1 and if we have anything else, if we have i to the fourth k plus 1 power or plus 2 power we can then just do this technique right over here.