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

Action Reasoning:
The last action taken was "paint-up," where robot1 painted tile_0-0 black. According to the rules, after a "paint-up" action, the robot should move horizontally if there are unpainted tiles in the row above. Since tile_0-1 is not painted, the robot should move right to tile_1-1. This will position it to paint tile_0-1 next.

New State Description:
Robot1 moves from tile_1-0 to tile_1-1, holding the black paint gun. Tile_1-0 becomes clear, and tile_1-1 is now occupied by robot1.

Action Chosen:
right(robot1, tile_1-0, tile_1-1)
