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 is necessary because the goal state requires an alternating color pattern, and the robot is currently holding white. The next tile to be painted (tile_0-4) should be black, so changing the color from white to black is the correct action to take.

New State Description:
Robot1 is now holding black paint instead of white while occupying tile_1-4. The tile_1-4 remains occupied by the robot, and tile_1-3 is clear.

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