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

Action Reasoning:
The last action taken was "paint-up" with robot1, and the tile directly above (tile_0-2) is now painted black. According to the guidelines, after a "paint-up" action, if there are any unpainted tiles in the row above, we should move horizontally. Since the row above still has unpainted tiles, and tile_0-3 is unpainted, the next best action for robot1 is to move right from tile_1-2 to tile_1-3. This aligns with progressing towards the goal state, where the first row needs to be painted in the specified alternating pattern.

New State Description:
Robot1 moves from tile_1-2 to tile_1-3, occupying tile_1-3, and leaving tile_1-2 clear.

Action Chosen:
right(robot1, tile_1-2, tile_1-3)
