Attempt Number: 4
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 involve moving the robot horizontally if there are still tiles in the row above that need painting. Since the robot is currently at tile_1-0 and the tile above it (tile_0-0) is already painted, the robot should move to the right to tile_1-1. This allows the robot to be in position to paint tile_0-1, which is the next unpainted tile in the alternating color pattern. Moving right is the best action to progress towards the goal state.

New State Description:
Robot1 moves from tile_1-0 to tile_1-1, occupying tile_1-1. Tile_1-0 is now clear.

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