Attempt Number: 3
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 is necessary because the goal state requires an alternating color pattern, and the robot is currently holding black paint. The next tile to be painted (tile_0-4) should be white according to the goal state. Therefore, changing the color from black to white is the best action to take next.

New State Description:
Robot1 is now on tile_1-4, holding white paint. The tile_1-4 remains occupied by Robot1, and tile_1-3 is clear.

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