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 robot1 horizontally to continue painting the row above. Since robot1 is currently on tile_1-4 and the goal is to paint the first row in an alternating pattern, the next step is to move robot1 left to tile_1-3. This action allows robot1 to continue the painting sequence and eventually reach tile_1-0, which is the starting point for the alternating pattern.

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 robot1, which is holding the black paint gun.

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