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

Action Reasoning:
The next best action is to move car_2 from behind car_3 to the empty curb_1. This will clear car_3 on curb_2, making car_3 free to move to its target curb_3.

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)
