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

Action Reasoning:
Car 2 needs to move to an empty curb to clear car 3, and curb 1 is empty, meeting preconditions for moving. By moving car 2 to curb 1, car 3 becomes clear, allowing further rearrangements necessary for the goal state.

New State Description:
Curb_0 has car_0 parked, clear. Curb_1 has car_2 parked, clear and now occupied. Curb_2 has car_3 parked, clear now since car_2 moved. Curb_3 has car_1 parked, clear.

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