Attempt Number: 2
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
We need to clear curb_2 so that car_3 can be moved to curb_3. Moving car_2 from behind car_3 to the empty curb_1 will make car_3 clear.

New State Description:
Curb_0 has car_0 parked, clear. Curb_1 has car_2 parked, clear. Curb_2 has car_3 parked, clear. Curb_3 has car_1 parked, clear.

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