Attempt Number: 4
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
Since car_3 is currently clear and parked on curb_3, I will first move car_1 from behind car_2 on curb_1 to the empty curb_2 using the move-car-to-curb action. This clears car_2, allowing it to return to its rightful place on curb_2 later.

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

Action Chosen:
(move-car-to-curb car_1 car_2 curb_2)
