[<reference> directory listing]-> [<input> menu option]
[menu option]-> [<choice> 9. Show more]
[9. Show more]-> yes [Set usage menu number]
[Set usage menu number]-> [<reference> directory listing other]
[9. Show more]-> no [<choice>is valid menu option]
[is valid menu option]-> yes [send directory listing]
[send directory listing]-> [<reference> complete]
[is valid menu option]-> no [<reference>exit invalid menu option]
