Parent State ID: 74
State Depth: 11
Action Taken: pick-up(block_b)
Action Reasoning: Block B must be stacked on Block D for the goal state. Currently, Block D is clear on Block C. Therefore, I will pick up Block B from the table to stack it on Block D.
State Description: Block A is on the table and clear. Block B is now in the hand and no longer clear. Block C is on the table and not clear, with Block D stacked on it. Block D is on Block C and clear. The hand is not empty and is holding Block B.
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)', 'pick-up(block_b)']

INACTIVE REASON: action path invalid: The last action `pick-up(block_b)` is invalid because it violates the preconditions: `block_b` is not clear, `block_b` is not on the table, and the hand is not empty. The current state's description and visualization are accurate, but the last action is not logical for achieving the goal state.
