Create a Design Class Diagram based on the Use case description and design sequence diagram below for an expanded use case for the Diagram Editor application:

UC$1.$ Edit State Diagram

$4.$ System accordingly displays the updated state diagram.

where doX is one of $($other operations such as delete are omitted$)$:

$-$ add a state

$-$ add a transition

$-$ edit a state

$-$ edit a transition

$-$ undo last operation

$-$ redo last undone operation

Figure $9\mathrm{.}13$: Sequence diagram for Edit State Diagram