5. Create a UML state machine diagram to represent a fan that works the way:

From the off state, if the button is pressed, the fan will the strong ventilating state;

From the strong ventilating state, if the button is pressed, the fan goes to the medium ventilating state;

From the medium ventilating state, if the button is pressed, the fan goes to the weak ventilating state;

From the weak fan state, if the button is pressed, the fan goes to the off state.

6. Using UML State Machine Diagram model a hot/cold air conditioner.