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 robot should now move horizontally to continue painting the row above. The robot is currently on tile_1-1, and the tile directly above it, tile_0-1, is already painted. The next unpainted tile in row 0 is tile_0-2. Therefore, the robot should move right to tile_1-2 to prepare for painting tile_0-2. This move ensures we are progressing towards the goal state by positioning the robot to paint the next required tile in the alternating color pattern.

New State Description:
Robot1 moves from tile_1-1 to tile_1-2. Tile_1-1 is now clear, and tile_1-2 is occupied by Robot1, which is holding the white paint gun.

Action Chosen:
right(robot1, tile_1-1, tile_1-2)
