Parent State ID: 13
State Depth: 7
Action Taken: stack(d, b)
Action Reasoning: The block `d` should be stacked on `b` because it moves us closer to the goal state where `d` sits on top of `b`, which is our desired configuration.
State Description: Block `a` is on block `d` and is clear. Block `b` is on the table and is supporting block `d`. Block `c` is on the table and is clear. Block `d` is on block `b` and is supporting block `a`. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'stack(a, d)', 'unstack(c, b)', 'put-down(c)', 'stack(d, b)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: 
