Attempt Number: 4
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was a color change from black to white. According to the logical conclusions, after a color change, the next best action is to paint-up. Robot1 is currently holding white paint and is standing on tile_1-3. The tile directly above, tile_0-3, is not painted and is clear. Therefore, the best action is to paint-up tile_0-3 with white, which aligns with the goal state pattern.

New State Description:
Robot1 has painted tile_0-3 white while standing on tile_1-3. Tile_0-3 is no longer clear, and tile_1-3 remains occupied by Robot1 holding white paint.

Action Chosen:
paint-up(robot1, tile_0-3, tile_1-3, white)
