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

Action Reasoning:
The last action taken was moving the robot left to tile_1-0. According to the rules, after a move, the next action should be to change the color of the paint gun. The robot is currently holding black paint, but the next tile to be painted, tile_0-1, requires white paint. 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_1-0. Tile_1-0 is occupied by Robot1, and tile_1-1 is clear.

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