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

Action Reasoning:
The robot is currently at tile_1-1 and holding a black paint gun. The goal is to paint the first row in an alternating color pattern starting with black. The next step is to move the robot to tile_1-0, which is the starting point for painting the first row. Since tile_1-0 is clear, the robot can move left to reach it. This action aligns with the strategy of moving the highest robot to tile_1-0 first.

New State Description:
Robot1 has moved to tile_1-0, and tile_1-1 is now clear. Robot1 is still holding a black paint gun.

Action Chosen:
left(robot1, tile_1-1, tile_1-0)
