Strings are read from input into list cities$\_$to$\_$pick. In create$\_$routes$(),$ complete the recursive case to perform the following tasks for each element at index i in remain$\_$cities:

Create a new list that contains all elements of remain$\_$cities except the element at index i$.$

Create a second new list that contains all the elements in picked$\_$cities with the element at index i added at the end of the list.

Recursively call create$\_$routes$()$ with the two newly created lists as the arguments.