Parent State ID: 61
State Depth: 10
Action Taken: stack(block_d, block_c)
Action Reasoning: The hand is currently holding block D. To achieve the goal state, block D needs to be placed on block C, which is currently clear and on the table. Therefore, the next best action is to stack block D on block C.
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. 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 `block_c` must be clear is not met. `block_c` is not clear as `block_d` is already on it.
