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

Action Reasoning:
To approach the goal state, we'll first free car_3 by moving car_0 to an empty curb, curb_1. This allows repositioning car_3 at curb_3 as the next step; keeping focus on clarity allows uninterrupted movement alignment.

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 now clear.

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