I can only know one my_base_index !!!
if you look in the inputs that it gives you it has a loop, in that loop, which iterates an amount of times equal to your number of bases, it gives you the position of a base.
- you should create an array (call it myArray for now), and right underneath the line where it gives you my_base_index, you should assign myArray[ i ] to my_base_index.
(you get i from the loop that is iterating over the bases)