Attempt Number: 3
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
To achieve the goal state, I need to move car_2 from curb_1 to curb_3, double parking it behind car_3. This requires swapping positions of car_2 and car_1, establishing car_1 at curb_1.

New State Description:
Curb_0 contains car_0, clear. Curb_1 is empty, clear. Curb_2 contains car_1, clear. Curb_3 contains car_3, not clear, and car_2, clear, double parked behind car_3. Car_0 is parked and clear. Car_1 is parked and clear. Car_2 is double parked and clear. Car_3 is parked and not clear.

Action Chosen:
(move-curb-to-car car_2 curb_1 car_3)
