Attempt Number: 4
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was "paint-up," which means the next logical step is to move the robot horizontally if there are unpainted tiles in the row above. Since the robot is currently on tile_1-4 and the goal is to alternate colors starting with black, the next tile to be painted above is tile_0-3, which should be white. Therefore, the robot should move left to tile_1-3 to position itself for the next paint-up action.

New State Description:
Robot1 moves from tile_1-4 to tile_1-3, holding white paint. Tile_1-4 is now clear, and tile_1-3 is occupied by Robot1.

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