Error: Oops, try again. remove_duplicates([4, 5, 5, 4]) returned  instead of [4, 5]
It seems like the loop isn't cycling through the entire list. Why?
def remove_duplicates(numbers): new_list =  for n in numbers: if numbers.count(n) > 1 and n not in new_list: new_list.append(n) return new_list else: return numbers