Attempt Number: 4
Error Message: The action and resulting child state have already been explored.

Action Reasoning:
The last action taken was a color change to black. According to the rules, after a color change, the next action should be to paint-up. Robot1 is currently holding black paint and is positioned at tile_1-1. The tile directly above, tile_0-1, is already painted white. The next unpainted tile in the row above is tile_0-2. Therefore, the best action is to move right to tile_1-2, preparing to paint tile_0-2 black.

New State Description:
Robot1 moves from tile_1-1 to tile_1-2. Tile_1-1 becomes clear, and tile_1-2 is now occupied by Robot1.

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