Attempt Number: 2
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was a move (right(robot1, tile_1-2, tile_1-3)), and according to the logical conclusions, after a move, the next step should be to change the color of the paint gun. Robot1 is currently holding black paint, and the next tile to be painted (tile_0-3) should be white according to the goal state. Therefore, the best action is to change the color from black to white.

New State Description:
Robot1 is now holding white paint while standing on tile_1-3. Tile_1-3 remains occupied by Robot1, and tile_1-2 is clear.

Action Chosen:
change-color(robot1, black, white)
