Assume that you have a professional fruit blender. In its first state, the blender is full of fruits waiting to start blending. The user first must select a power level (High, medium, low) depending on the required texture for the juice. Once the power level is selected, the user can press the start button to start blending. The blender will stop either if the user presses the stop button or opens the blender cover. The user can continue blending by pressing on start button again. At any time, the user can switch between power levels. In all cases, the blender will not blend fruits unless its cover is closed. 

Based on the above scenario, model the state transition diagram for the fruit blender.