Parent State ID: 21
State Depth: 5
Action Taken: unstack(block_a, block_b)
Action Reasoning: The next best action is to unstack block A from block B. This allows us to place block D on block C directly, as block C is already clear. This brings us closer to the goal of creating the desired stack sequence.
State Description: Block A is in the hand and is not clear. Block B is clear and on block D, which is not clear. Block C is still on the table and clear. Block D remains on the table and is clear. The hand is holding block A.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'pick-up(block_a)', 'stack(block_a, block_b)', 'unstack(block_a, block_b)']

successfully verified the action of new state 28 with the path: The last action `unstack(block_a, block_b)` is valid as all preconditions are met, and the effects are correctly reflected in the current state. The natural language description, diagram encoding, and visualization of the current state are accurate and consistent with the sequence of actions taken.
