Define an object that implements the Iterator abstract data type. This object will allow you to start at the first item in the list, access that item, then advance to the next item until all desired items in the list have been accessed. In order to be able to work with any list, your iterator object creator function will take the list over which to iterate as an argument. Your object should expose methods for has-next? Returns a boolean value (#t or #f) depending on whether the there are any items that have not been accessed. That is, if the list is null or the rest of the list is null. next Advances to the next item in the list and returns that item. current Returns the value currently at the head of the list. begin Rewinds to the head of the original list. end Advances to the last item in the list.