Parent State ID: 30
State Depth: 8
Action Taken: stack(d, c)
Action Reasoning: The goal is to have block 'd' on top of block 'b', so the next best action is to stack block 'd' on block 'c', which is clear and on top of block 'b'.
State Description: Block `a` is on the table and clear. Block `b` is on the table and supports block `c`. Block `c` is on block `b` and supports block `d`. Block `d` is on block `c` and is clear. The hand is empty.
Action Path: ['unstack(d, a)', 'put-down(d)', 'unstack(a, c)', 'put-down(a)', 'pick-up(d)', 'put-down(d)', 'pick-up(d)', 'stack(d, c)']

INACTIVE REASON: deactivated because diagram generation failed or invalid action chosen: The action does not align with the goal state's requirement of having block 'd' directly on block 'b'.
