Attempt Number: 3
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The robot is currently at tile_1-4 and holding the white paint gun. According to the goal state, the first tile to be painted is tile_0-0, which should be black. The robot needs to move to tile_1-0 first. Since the robot is at tile_1-4, the next logical step is to move left towards tile_1-0. The shortest path to tile_1-0 is to move left. Therefore, the best action is to move the robot left from tile_1-4 to tile_1-3.

New State Description:
Robot1 has moved from tile_1-4 to tile_1-3. Tile_1-4 is now clear, and tile_1-3 is occupied by the robot. Robot1 is still holding the white paint gun.

Action Chosen:
left(robot1, tile_1-4, tile_1-3)
