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

Action Reasoning:
Since the robot is on tile_1-1 holding black and the tile directly below (tile_2-1) is clear, the best action is to paint-down. This action will make progress towards the goal state by painting tile_2-1 black, as required.

New State Description:
(tile_0-1: clear, tile_0-2: clear, tile_0-3: clear, tile_1-1: occupied by robot1 holding color black, tile_1-2: clear, tile_1-3: clear, tile_2-1: painted black, tile_2-2: clear, tile_2-3: clear, robot1: on tile_1-1 holding color black, color_white: available, color_black: available)

Action Chosen:
paint-down(robot1, tile_2-1, tile_1-1, black)
