Parent State ID: 11
State Depth: 7
Action Taken: stack(b, c)
Action Reasoning: To achieve the goal state, we need block b on top of block c. Since blocks b and c are already clear and positioned on the table, the next step is to stack block b onto block c.
State Description: Block `a` is on block `d` and clear. Block `b` is on block `c` and clear. Block `c` is on the table and supporting block `b`. Block `d` is on the table and supporting block `a`. The table is supporting block `c` and block `d`. The hand is empty.
Action Path: ['unstack(d a)', 'put-down(d)', 'pick-up(a)', 'stack(a d)', 'unstack(c b)', 'put-down(c)', 'stack(b, c)']

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.
