Parent State ID: 87
State Depth: 9
Action Taken: down(robot1, tile_1-1, tile_2-1)
Action Reasoning: The robot should move down to paint the next required tile in row 2 with black, matching the goal state. This step aligns with the requirement to complete row 2 before moving upwards.
State Description: Tile tile_0-1 is clear. Tile tile_0-2 is clear. Tile tile_0-3 is clear. Tile tile_1-1 is clear. Tile tile_1-2 is clear. Tile tile_1-3 is clear. Tile tile_2-1 is occupied by robot1 holding color black. Tile tile_2-2 is painted white. Tile tile_2-3 is painted black. Robot1 is on tile_2-1, holding color black. Colors white and black are available for switching.
Action Path: ['right(robot1, tile_0-1, tile_0-2)', 'down(robot1, tile_0-2, tile_1-2)', 'paint-down(robot1, tile_2-2, tile_1-2, white)', 'change-color(robot1, white, black)', 'paint-down(robot1, tile_2-3, tile_1-2, black)', 'left(robot1, tile_1-2, tile_1-1)', 'down(robot1, tile_1-1, tile_2-1)', 'up(robot1, tile_2-1, tile_1-1)', 'down(robot1, tile_1-1, tile_2-1)']

successfully verified the action of new state 111 with the path: The last action `down(robot1, tile_1-1, tile_2-1)` is valid because all preconditions are met, and the effects are correctly updated in the current state. The action logically progresses towards the goal state by positioning the robot to paint `tile_2-1`. The natural language description and visualization of the current state are accurate and consistent with the sequence of actions taken.

INACTIVE REASON: Pruned in beam search
