Parent State ID: 61
State Depth: 10
Action Taken: stack(block_d, block_c)
Action Reasoning: Block D is currently held by the hand and should be placed on block C to build upward towards the goal state. This clears the hand and sets up the stack for other blocks.
State Description: Block A is on the table and clear. Block B is on the table and clear. Block C is on the table and supports block D. Block D is on block C and clear. The hand is empty.
Action Path: ['unstack(block_b, block_c)', 'stack(block_b, block_d)', 'unstack(block_b, block_d)', 'stack(block_b, block_d)', 'unstack(block_b, block_d)', 'stack(block_b, block_c)', 'unstack(block_b, block_c)', 'put-down(block_b)', 'pick-up(block_d)', 'stack(block_d, block_c)']

INACTIVE REASON: action path invalid: The last action `stack(block_d, block_c)` is invalid because the precondition that the hand must be holding `block_d` is not met. The hand is empty before the action, violating the precondition. The current state's natural language description and visualization are accurate, but the action sequence is flawed.
