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 next tile to be painted (tile_0-1) should be white. Robot1 is currently holding black paint, so changing the color to white is the best action to align with the goal state.

New State Description:
Robot1 is now holding white paint while standing on tile_1-1. Tile_1-0 is clear, and tile_1-1 is occupied by Robot1. The tile above, tile_0-1, is not yet painted.

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