Attempt Number: 4
Error Message: The action paint-up(robot1, tile_0-2, tile_1-2, black) has already been explored.

Action Reasoning:
The last action was a color change, and according to the strategy, the subsequent action should be to paint the tile directly above the robot. Robot1 is currently on tile_1-2 and has its paint gun color changed to black. The tile directly above Robot1, tile_0-2, is clear and not yet painted. Therefore, the best action is to paint tile_0-2 with the black color that Robot1 is holding.

New State Description:
Robot1, located on tile_1-2, has painted tile_0-2 above it with the color black. Tile_0-2 is now no longer clear, as it is painted.

Action Chosen:
paint-up(robot1, tile_0-2, tile_1-2, black)
