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

Action Reasoning:
The last action taken was a move to the right, which means the next logical step is to change the color of the paint gun. This aligns with the pattern of alternating colors in the goal state. Since robot1 is currently holding black paint and the next tile to be painted (tile_0-3) should be white, changing the color from black to white is the correct action.

New State Description:
Robot1 is now holding white paint while standing on tile_1-3. The tile_1-3 remains occupied by robot1, and tile_1-2 is clear.

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