Attempt Number: 6
Error Message: Action not unique compared to other actions chosen from this state before. Choose a new action

Action Reasoning:
The most advantageous next step is to move car_0 from behind car_3 in curb_3 to the empty curb_1. This action directly progresses towards the goal by creating desired positions.

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. All cars are in their correct goal positions.

Action Chosen:
(move-car-to-curb car_0 car_3 curb_1)
