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

Action Reasoning:
The last action was "paint-up," which means the next step is to move the robot horizontally if there are unpainted tiles in the row above. Since tile_0-4 is not painted yet, the robot should move right to tile_1-4 to position itself for painting tile_0-4. This action aligns with the goal of painting the first row in an alternating pattern and avoids revisiting previously explored states.

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

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