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

Action Reasoning:
The last action taken was changing the color of the paint gun. According to the rules, the next best action is to paint the tile directly above the robot. Robot1 is currently holding black paint and is on tile_1-3. The tile above, tile_0-3, is already painted white, so the next tile to paint is tile_0-4, which is not painted. However, since the robot must paint directly above its current position, the correct action is to move Robot1 to the right to tile_1-4, which is clear, allowing it to paint tile_0-4 on the next turn.

New State Description:
Robot1 moves from tile_1-3 to tile_1-4. Tile_1-3 becomes clear, and tile_1-4 is now occupied by Robot1, which is holding black paint.

Action Chosen:
right(robot1, tile_1-3, tile_1-4)
