Parent State ID: 74
State Depth: 11
Action Taken: stack(block_b, block_d)
Action Reasoning: The next best action is to stack block B on block D. Block D is currently on block C and is clear, and stacking block B on block D will bring us closer to the goal state by building the desired stack.
State Description: Block A is on the table and clear. Block B is on block D and clear. Block C is on the table and not clear, with block D stacked on it. Block D is on block C and not clear, with block B stacked on it. 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)', 'stack(block_b, block_d)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The hand is not holding block_b, violating the precondition for the stack action.
