Parent State ID: 61
State Depth: 10
Action Taken: stack(block_d, block_c)
Action Reasoning: The goal is to stack blocks in the order D, B, A on C. Currently, block D is held by the hand, and block C is clear. The best next action is to stack block D on block C to start building the stack from the base.
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 not clear with block D on it. Block D is clear and on block C. 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 its preconditions are not met: the hand is not holding `block_d`, and `block_c` is not clear. The current state's description and visualization are accurate, but the action does not logically follow from the previous state.
