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

Action Reasoning:
Since curb_1 is clear and located next to curb_0 where car_0 is clear and double-parked behind car_2, we can use curb_1 as a temporary space. Moving car_0 to curb_1 will leave car_2 clear, allowing us to achieve a more optimal sooner parking operation.

New State Description:
Curb_0: car_2 is parked and clear. Curb_1: car_0 is parked and clear. Curb_2: car_1 is parked and clear. Curb_3: car_3 is parked and clear.

Action Chosen:
(move-car-to-curb car_0 car_2 curb_1)
