Let's say I have a function called possible_change_combinations in Python. Basically, I have to pass in a number, which will be multiplied by 100 to represent the amount of "money" that I inputted. This function can only use 50, 20, and 10 dollar bills. I must have at least 5 bills of each kind. The function must return all possible combinations that will add up to the goal sum. How can I write this function? More details:

method signature: possible_change_combinations(x) Invoking possible_change_combinations(10) would give us a goal sum of 1000 dollars. One possible combination would be 65 tens, 5 twenties, and 5 fifties. In a list, it would look like [65, 5, 5]. Another possible combination would be [60,5,6]. The function should return all possible combinations, in a 2-dimensional list of lists. I can not import any packages.