Attempt Number: 3
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was a change-color action, where robot1 changed its paint gun color from black to white. According to the rules, after a color change, the next best action is to paint-up. Robot1 is currently on tile_1-4 and holding white paint. The tile directly above, tile_0-4, is clear and not yet painted. Therefore, the next logical step is for robot1 to paint tile_0-4 with the white color it is currently holding.

New State Description:
Robot1, standing on tile_1-4, has painted the tile directly above it, tile_0-4, with white paint. Tile_0-4 is no longer clear.

Action Chosen:
paint-up(robot1, tile_0-4, tile_1-4, white)
