Parent State ID: 17
State Depth: 4
Action Taken: stack(block_d, block_b)
Action Reasoning: To move closer to the goal state, we should first put block D on block B because block B is clear. This sets up the configuration to eventually place block A on top.
State Description: Block A is on the table and clear. Block B is on block C and not clear. Block C is on the table and not clear. Block D is on block B and clear. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_c)', 'pick-up(block_d)', 'stack(block_d, block_b)']

successfully verified the action of new state 24 with the path: The last action, stack(block_d, block_b), is valid as all preconditions are met, and it logically progresses towards the goal state. The current state's natural language description and visualization accurately reflect the sequence of actions taken.

INACTIVE REASON: Pruned in beam search
