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

Action Reasoning:
The last action taken was "paint-up," and the robot is currently on tile_1-2. According to the rules, after a "paint-up" action, the robot should move horizontally if there are any unpainted tiles in the row above. In this case, tile_0-3 is unpainted, so the robot should move right to tile_1-3 to prepare for painting tile_0-3. This action will bring us closer to the goal state by positioning the robot to paint the next necessary tile.

New State Description:
Robot1 moves from tile_1-2 to tile_1-3. Tile_1-2 is now clear, and tile_1-3 is occupied by Robot1.

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