Attempt Number: 2
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 step should be to move the robot horizontally if there are unpainted tiles in the row above. Since tile_0-2 is not painted, the robot should move right from tile_1-1 to tile_1-2. This will position the robot to paint the next tile in the sequence, following the alternating color pattern required for the goal state.

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

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