Parent State ID: 20
State Depth: 7
Action Taken: pick-up(d)
Action Reasoning: To achieve the goal state, block `d` needs to be on top of block `b`. Since block `d` is clear and the hand is empty, picking up block `d` is the best next action to prepare for stacking it on block `b`.
State Description: Block `a` is on the table and clear. Block `b` is on the table and supports block `c`. Block `c` is on block `b` and is clear. Block `d` is held by the hand. The hand is not empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'put-down(d)', 'pick-up(d)']

successfully verified the action of new state 30 with the path: The last action, pick-up(d), is valid because block d was on the table and clear, and the hand was empty before the action. The current state's description and visualization accurately reflect the sequence of actions taken, with all blocks in their correct positions and statuses. All objects from the initial state are present in the current state's visualization.
